Ignore my last comment, I got the amp working and it sounds great. David was really nice and agreed to send it to Ireland for cheap. I highly recommend this to anyone looking for a simple project
Hi - David - Just finished making and testing my Qrome amp. Brilliant - worked first time! I’m really pleased with it as a project, and little practice amp. I bought a 3” 8 ohm 30w speaker, and build a sturdy cab, so I think I’ve probably got the best out of it. My only problems were - cost of shipping to UK, identifying correct resistors (although I did manage!), and could have done with a couple more jumper leads (although as you mention I could have soldered wires). The jumper leads work fine from socket to amp without soldering. Cheers, all the best Terry
Terry, thank you for the feedback and glad you are enjoying the amp. I wish I could ship cheaper to the UK. I agree about trying to identify the correct resistors -- I am thinking of adding some close up photos with labels to the printed sheet that comes with it. Thanks!
Great video - very clear and your boards are top quality. Such a good kit, once i realised the jack sockets i had bought were trash and therefore never worked properly...really great.... built 2 cigar box amps so far....
Nice. I have a pre built lm386 that I got from china a few years back and I put together a 2 valve/tube pre amp board also from china. I plan at some point in using them both in a home made guitar amp. I also have a 1953 philips disc jockey senior record player which I intend on turning into a guitar amp. Also I plan on making a few guitar pedals and have bought loads of electronic components, germanium transistors, pedal enclosures etc. I'm probably overdoing it with projects LOL
Год назад+1
Hi, your kit is out of stock. Can you share the schema and parts list? Tnx
This is very nice that you are sharing your work. I would like to learn to build a solid state with larger primative but stable components, and substitute an analog circuit for the chip. Then I would like a reverberator with tone and dynamic control. I am waiting to hear your beautiful looking amp.
OK,, quick question. WHY did you use the Orange Ceramic caps on some places and the Blue on the 1 place? what's the difference? does it matter? I have tons of the blue caps but not sure if I have the Titanium ones(Orange).
JohnAudioTech has a pretty good schematic, just remember to add a 5-10k pot in series with the 10u cap between pin 1 and 8. Otherwise the one on the datasheet is also alright.
I just finished building this amp, can I use a tube rectifier as power supply? I've been learning about tubes lately, and if I understand right that's what rectifier circuits are for.
Hi David - Great vids. I've just ordered an amp kit from Etsy - may take a while to arrive as I'm in the UK! I'm wondering what speaker(s) to acquire? Afraid I know very little about electronics. I notice you use a couple of different speakers in your builds. You specify 3'', and 4 or 8 Ohm, but not what wattage. I know ohms is important, but not sure about size or watts. Could you tell me what the crucial specs are please? Cheers Terry
Terry, excited for you to make the amp. I typically go to the local thrift shops (Goodwill or Savers) and look at the donated speaker boxes. I have found that the 3" 8ohm speakers sound really nice. I wire them up and often test them while they are in their original speaker cabinet to hear the sound. I typically look for stuff in the range of 5 - 30 watts -- though I have tested some that are much higher. If the watt rating is too high they just don't have the same sound and the amp may start to get hot. I hope that helps.
@@Qromer Hi David - thanks for getting back so soon with info. I was looking on a local Flee Market stall yesterday that had a variety of secondhand speakers, but didn't buy in case I chose wrong one. I'm just trying out a bit of electronics and it all baffles me. Seems amazing you can use such a high wattage speaker with such a small amp - I guess physical size is important here? How many watts is your amp? Cheers Terry
Terry Pashley Hi David - just to let you know amp has arrived, so thanks very much for your attention to things. I'm not going to rush at it - got a couple of guitar builds on the go - but will let you know how I go on. Cheers Terry
High gain will add distortion and Volume will simply add volume. Check out a data sheet for the LM386 -- they give examples out to use them. The gain is between pins 1 and 8 -- with a potentiometer and a capacitor. Volume is on pin 7.
Thanks, I did design this board but it was based on the examples from the LM386 specification sheet. They give some very good examples how the chip can be used.
@@Qromer Ok fair enough, then I have one more question... I currently do not have any 10k ohm pots... I would have to order some. I do however have a bunch of 50k pots. I was wondering, I know that the resistance in this instance is not super important but I fear the voltage drop across the pot will be too high for it to work properly. Any insight?
The board has the open source hardware logo on it but I do not see where you have posted this circuit diagram or board layout. Can you share that with us?
@@Qromer hey, could you release the source files? after all you are selling a board which says it is Open Hardware, so you must either release the files or realise it would be a fraud to advertise with such logo. OSH means something, you can't use it just for looks, it also has legal implications BTW.
@@emilianovalenciaa That's not actually the logo used. The logo used has the words 'open hardware' or 'open source hardware' which I don't see on his board. Otherwise, it's just a shape.
The header pins are great, but sucks when wires pop off. When I make a permanent mounted amp, I solder the wires directly to the pad and hole. Otherwise, you can use any standard 2.54 Header Pins. These are like the ones I use from Amazon: amzn.to/3vw092h
can you give the schematic please? and pcb circuit and components too if possible. also i want to connect output jack to the amp instead of connecting directly to the speaker, how can i do that
Great little module! Given that it is allegedly Open Source Hardware, where can we find the schematic and board files? as this is a must of true OSH. Thanks!
Thanks for the comment. Sorry, at the time I placed the OSH symbol on the screen I simply thought it looked cool. The full schematic is based on the one provided by the LM386 datasheet. It was not derived from an OSH project and is not under the license. You can view the LM386 samples here: www.ti.com/lit/ds/symlink/lm386.pdf?ts=1617997878307
@@Qromer Ok, I see. It's such a pity since your design is very good looking and would be a great resource for the open source community. Anyways, it's good to see it as a reference. I will attempt to develop a simillar version and hopefully share it around.
I'm not sure you check the comments, but i followed the instructions laid out in the vid. When I plug my guitar into the amp, the LM386 chip gets very hot. The led turns on but no sound is coming out of the speaker.
Thanks Jamey, yes I include the parts list with the boards when they ship. They are also listed along with the board on the Etsy listing. Let me know if you don't find them.
Attila, sorry, I am not selling the full kit but all the parts are standard and easily sourced. Currently only the blank board is available. A full part list is listed with the board.
@@Qromer Perfect Do please let me know as soon as they come in, i will take a few off your hands lol Will you be able to ship the boards in a normal Envelop to save shipping cost to Canada? . I am a woodworker and i have been wanting to make a few little portable amps out of some nice Cherry burl wood. I have a few 3inch 4ohms 10watt speakers i wish to use for those, Do you think they will work out ?And thank you for the quick reply, much appreciated
If i want to fit this into a guitar to use headphones, can i wire the audio output plug to power on the device, as opposed to the input? My input would be hard wired into the guitar, leaving the headphone plug to be my other choice
Most likely 500k I would have thought. If it had a tone pot then maybe that would be a different value. I'm certainly no expert, I'm learning myself but 500k would have good controllability for the volume and gain, and a 1000k (1 meg) pot would have even better control
Yeah, if you look at the back of the speaker there is usually an ohm rating. Most car audio and home audio is 4 - 8 ohm rating. I find lots of great speakers from Goodwill or Savers (thrift stores). Most of those surround sound speaker systems are 4 to 8 ohm ratings and you can get them cheap. Does that help?
Ignore my last comment, I got the amp working and it sounds great. David was really nice and agreed to send it to Ireland for cheap. I highly recommend this to anyone looking for a simple project
Hi - David - Just finished making and testing my Qrome amp. Brilliant - worked first time! I’m really pleased with it as a project, and little practice amp. I bought a 3” 8 ohm 30w speaker, and build a sturdy cab, so I think I’ve probably got the best out of it. My only problems were - cost of shipping to UK, identifying correct resistors (although I did manage!), and could have done with a couple more jumper leads (although as you mention I could have soldered wires). The jumper leads work fine from socket to amp without soldering. Cheers, all the best Terry
Terry, thank you for the feedback and glad you are enjoying the amp. I wish I could ship cheaper to the UK. I agree about trying to identify the correct resistors -- I am thinking of adding some close up photos with labels to the printed sheet that comes with it. Thanks!
Cheers David, thanks for reply. All the best, Terry@@Qromer
This is the best DIY I have ever seen. NICE!!!
Thanks Bruce!
Great video - very clear and your boards are top quality. Such a good kit, once i realised the jack sockets i had bought were trash and therefore never worked properly...really great.... built 2 cigar box amps so far....
Awesome! Thanks for the feedback.
That little amp looks classy as hell.
Great video . I just ordered 3 pcb's from your etsy link ! :)
Great vid! I really dig the background music
Very informative video, thanks for sharing boss!
Nice. I have a pre built lm386 that I got from china a few years back and I put together a 2 valve/tube pre amp board also from china. I plan at some point in using them both in a home made guitar amp.
I also have a 1953 philips disc jockey senior record player which I intend on turning into a guitar amp. Also I plan on making a few guitar pedals and have bought loads of electronic components, germanium transistors, pedal enclosures etc. I'm probably overdoing it with projects LOL
Hi, your kit is out of stock. Can you share the schema and parts list? Tnx
Do you have a schematic of the amp circuit?
got it?
I would like one also. Would be nice to play around with the values.
This is very nice that you are sharing your work.
I would like to learn to build a solid state with larger primative but stable components, and substitute an analog circuit for the chip.
Then I would like a reverberator with tone and dynamic control.
I am waiting to hear your beautiful looking amp.
The chip is already analog. You're feeding it an analog signal (the guitar) and it is outputting that same signal... just amplified.
Great Video! I would very much like to buy two amp boards. But the etsy shipping costs to Germany are insanely high. Are there possibilities? ;-)
Yeah, I totally feel for you. Unfortunately those shipping rates are actual cost -- no padding on them at all. Very sorry.
OK,, quick question. WHY did you use the Orange Ceramic caps on some places and the Blue on the 1 place? what's the difference? does it matter? I have tons of the blue caps but not sure if I have the Titanium ones(Orange).
Give them a try. It will probably work just fine.
I came here to ask the very same thing. I have the orange but no blue. Did you get the amp to work?
Where can we get one, do you have kits? Also can we wire up a mains power?
Links are in the description.
Thanks for this video. What kind of battery pack is that? LiPo 2s or 3s? Thanks!
It was a 3S lipo (12V) battery.
Hey can you please release a schematic ?
JohnAudioTech has a pretty good schematic, just remember to add a 5-10k pot in series with the 10u cap between pin 1 and 8. Otherwise the one on the datasheet is also alright.
Very very very good sar
So cool. Thanks David!
Thanks for the support!
I just finished building this amp, can I use a tube rectifier as power supply? I've been learning about tubes lately, and if I understand right that's what rectifier circuits are for.
Belle réalisation !! :) cool
Hi David - Great vids. I've just ordered an amp kit from Etsy - may take a while to arrive as I'm in the UK! I'm wondering what speaker(s) to acquire? Afraid I know very little about electronics. I notice you use a couple of different speakers in your builds. You specify 3'', and 4 or 8 Ohm, but not what wattage. I know ohms is important, but not sure about size or watts. Could you tell me what the crucial specs are please? Cheers Terry
Terry, excited for you to make the amp. I typically go to the local thrift shops (Goodwill or Savers) and look at the donated speaker boxes. I have found that the 3" 8ohm speakers sound really nice. I wire them up and often test them while they are in their original speaker cabinet to hear the sound. I typically look for stuff in the range of 5 - 30 watts -- though I have tested some that are much higher. If the watt rating is too high they just don't have the same sound and the amp may start to get hot. I hope that helps.
@@Qromer Hi David - thanks for getting back so soon with info. I was looking on a local Flee Market stall yesterday that had a variety of secondhand speakers, but didn't buy in case I chose wrong one. I'm just trying out a bit of electronics and it all baffles me. Seems amazing you can use such a high wattage speaker with such a small amp - I guess physical size is important here? How many watts is your amp? Cheers Terry
Terry Pashley Hi David - just to let you know amp has arrived, so thanks very much for your attention to things. I'm not going to rush at it - got a couple of guitar builds on the go - but will let you know how I go on. Cheers Terry
what is the difference between the volume knob and the gain knob? and where in circuit do they come in the circuit.
High gain will add distortion and Volume will simply add volume. Check out a data sheet for the LM386 -- they give examples out to use them. The gain is between pins 1 and 8 -- with a potentiometer and a capacitor. Volume is on pin 7.
what is the difference between 1.1 board and the 1.2
There were some label changes. Like. For the resistor on the LED.
Hey great video and love the simplicity. Questions, did you design this? Is it based on proprietary IP? Can you share the circuit diagram? Thanks!
Thanks, I did design this board but it was based on the examples from the LM386 specification sheet. They give some very good examples how the chip can be used.
@@Qromer Ok fair enough, then I have one more question... I currently do not have any 10k ohm pots... I would have to order some. I do however have a bunch of 50k pots. I was wondering, I know that the resistance in this instance is not super important but I fear the voltage drop across the pot will be too high for it to work properly. Any insight?
The board has the open source hardware logo on it but I do not see where you have posted this circuit diagram or board layout. Can you share that with us?
The board does have the logo -- but only because like the way it looked. It has not been released under the OSH though. Sorry.
@@Qromer hey, could you release the source files? after all you are selling a board which says it is Open Hardware, so you must either release the files or realise it would be a fraud to advertise with such logo.
OSH means something, you can't use it just for looks, it also has legal implications BTW.
@@emilianovalenciaa That's not actually the logo used. The logo used has the words 'open hardware' or 'open source hardware' which I don't see on his board. Otherwise, it's just a shape.
Hi
Great build
Have ordered the boards (5 pack)
Can u get me a parts list as your Etsy shop is sold out
Sent you the list in Etsy message. Thanks Mark! Also, the list is available with the listing but you have to click show more information.
Do you have a ink to where you get the jumper pins?
The header pins are great, but sucks when wires pop off. When I make a permanent mounted amp, I solder the wires directly to the pad and hole. Otherwise, you can use any standard 2.54 Header Pins. These are like the ones I use from Amazon: amzn.to/3vw092h
Do you have any schematic of this?
Yes, it comes with the board
can you give the schematic please? and pcb circuit and components too if possible. also i want to connect output jack to the amp instead of connecting directly to the speaker, how can i do that
Schematic is shipped with the board.
@@Qromer i have a project in college so i have to make the pcb board itself, so im making everything myself, thats why needed schematic
Great little module! Given that it is allegedly Open Source Hardware, where can we find the schematic and board files? as this is a must of true OSH. Thanks!
Thanks for the comment. Sorry, at the time I placed the OSH symbol on the screen I simply thought it looked cool. The full schematic is based on the one provided by the LM386 datasheet. It was not derived from an OSH project and is not under the license. You can view the LM386 samples here: www.ti.com/lit/ds/symlink/lm386.pdf?ts=1617997878307
@@Qromer Ok, I see. It's such a pity since your design is very good looking and would be a great resource for the open source community. Anyways, it's good to see it as a reference. I will attempt to develop a simillar version and hopefully share it around.
I'm not sure you check the comments, but i followed the instructions laid out in the vid. When I plug my guitar into the amp, the LM386 chip gets very hot. The led turns on but no sound is coming out of the speaker.
Contact me through Etsy and send some close up photos of the board front and back.
I just purchased some of your boards on Etsy do you have a parts List? schematic would be helpful but a parts list would be Ideal~
Thanks Jamey, yes I include the parts list with the boards when they ship. They are also listed along with the board on the Etsy listing. Let me know if you don't find them.
Is the guitar directly connected to amplifier input or some resistor in series?
Not sure I understand. The video shows the guitar connection to the input with a standard guitar cable.
@@Qromer that means we can connect any guitar to any amplifier directly to input ?
Hi! I would like to buy it with all components, where can I find it on the internet? DIY Kit: Qrome Guitar Amplifier ? Thank you!
Attila, sorry, I am not selling the full kit but all the parts are standard and easily sourced. Currently only the blank board is available. A full part list is listed with the board.
Do you plan on getting more boards? your Etay says your out of stock, If not can you provide the Gerber files, please.
Yes, waiting for them to come in. Thanks.
@@Qromer Perfect Do please let me know as soon as they come in, i will take a few off your hands lol Will you be able to ship the boards in a normal Envelop to save shipping cost to Canada? . I am a woodworker and i have been wanting to make a few little portable amps out of some nice Cherry burl wood. I have a few 3inch 4ohms 10watt speakers i wish to use for those, Do you think they will work out ?And thank you for the quick reply, much appreciated
If i want to fit this into a guitar to use headphones, can i wire the audio output plug to power on the device, as opposed to the input? My input would be hard wired into the guitar, leaving the headphone plug to be my other choice
Yes, I think that should work. I have not tried it that way.
Qromer cool thank you bro 👍🏻
Can i buy the board pls?
Yes, send me a message here or through Etsy and we can help you.
What is the values of gain and volume potentiometer
Most likely 500k I would have thought. If it had a tone pot then maybe that would be a different value. I'm certainly no expert, I'm learning myself but 500k would have good controllability for the volume and gain, and a 1000k (1 meg) pot would have even better control
I have assembled my amp but when I plug it in all I hear is static. any advice?
Yes, verify all the wiring is correct. Make sure the LM386 is in the correct orientation on the board. Make sure the audio jack is wired correctly.
Qromer so I couldn’t get the guitar amp to work but I am able to hear radio which is kinda cool
Can someone give the V ratings on the E caps?
10, 100 & 1000uF
Trying to order parts and the kit doesn't say.
I think I used 25v but, you should be able to use anything over 12 volt.
Can I use a lm386n-1 instead of a 386-4?
Yes... It should work.
The kit got sold out😢 how to get it now?
I will be listing more very soon. Sorry about that.
Hi, got anymore PCBs, all sold out.
I just listed more of the blank PCBs -- thanks!
Can i get the pcb diagram?
This board was based on the examples from the LM386 specification sheet. They give some very good examples how the chip can be used.
Do you have the gerber files for the PCB posted anywhere?
No, I do not.
@@Qromer A shame. This would have been a fun little project. But not at 10 dollars for a 50 cent pcb. Sorry.
I'll just use a perf board.
4 ohm speaker?
Yeah, if you look at the back of the speaker there is usually an ohm rating. Most car audio and home audio is 4 - 8 ohm rating. I find lots of great speakers from Goodwill or Savers (thrift stores). Most of those surround sound speaker systems are 4 to 8 ohm ratings and you can get them cheap. Does that help?
@@Qromer I just needed to know if the amp was rated for 4 or 8 ohm speakers. Sometimes 4ohm is too low. Thanks.