2nd try. First upload got a copyright content match so I had to edit and upload again. Anyhoo, it's been almost 4 years since I started this project. I wasn't in any hurry so it's good to call it done. Next, I want to collaborate on a power supply for it. That wont take long (I hope).
Oh Mang.! this is looking just wonderful, Proud of you Mang" this Jat will never Jat its Pants, well done, I sincerely mean that. much Jat in the Hat love from me here in Dunedin N.Z May the Jat be with you Mang"
At last your JAT501 project has completed. And the main thing is all necessary files and documents are free on RUclips. It's very hard to find a good quality audiofile design with all details. Really hats off your efforts and contributions sir, 🙏🙏thank you.
Hott Damn John, you did it!!! Thank you. I'm downloading your files and going to place an order today. Congratulations on your 50k. Well deserved, my friend.
Love your work, John. Very much. I can’t wait to build one. You should maybe think about some way for us to share back with you what we’ve built with your design. Roll on the next one!
Hey John, As a long time loyal sub, Thank you for all the years of great content. It's about quality, not quantity in my book. Been very busy with work and life lately, trying to keep up. Very nice work on the JAT501. I hope you and yours are all doing well. Winter is basically over, Happy Spring. Getting nice in Oregon. All the Best, Cass.
Thanks for everything, It's very interesting to watch your videos and stuff, I have learned many things from you, Hopefully you'll get 100k subscribers sooner than ever, 🤗
Hi John, if you can provide another set of component value that make even lower distortion, I guess lot of people here can did the comparison for you. Also if you have time, maybe try to measure the different between finished PCB and the perf board, the different in the performance may give a hint on future design.
Hey John, I noticed that on the the schematic, VR1 (200 Ohm trimmer resistor) has no wiper connection. There are 4 holes for this component on the inline board. How should a rectangular trimmer be oriented with these holes?
I want to build a 4 transistor amplifier to drive an 8 ohm speaker for a portable record player that uses a ceramic type cartridge, do you have any recommended circuits?
John you need to do a audiophile version but not technically but from what you hear. Cause we can hear more than a single parameter of measurement but multiple.
Hello.! Congratulations sir, thanks to your video I've learned a lot, ❤️ Btw I wish to know where to buy the components you've used for this project, thank you and God bless ❤️ 🇵🇭
Hi John. Do you think some day you could do a test & review 0n the TDA7498E DC 15-36V 2 Channel Audio Stereo Digital Power Amplifier Board 2*160W, available on ebay for about $25.00? Also would like to know if it's bridgeable. I am impressed with the JAT 501 and would like to buy some boards from somebody. I'm almost 70 and I'm not versed on how to use GERBER FILES at all. If someone has one or both boards or even a kit I would be interested in making a purchase.
I have a 7498E board in for review. Nothing needed to do with the gerber files other than sending them in to the PCB fab shop and they will make the boards for you.
@@JohnAudioTech Ok that's great, but I still have no idea how to send the request to I don't know where. Sorry to beat a dead horse but I'm totally ignorant about designing circuit boards or drawing schematics with a PC.. My schematics are hand drawn as in the old days. I wish some one could provide a course for dummies on these through YT or suggest a book to use along with the course. Still, I learn a lot and enjoy watching your vids.
Hi John. I am following up on your JAT501 project. I am also following on Eddie of Kiss Analog. I have putting the JAT501 into the Micro Cap simulator. From that I found something something in question. The bias at the IPS (the long tail) is only about 1mA instead of 2.4mA as you've mentioned sometime before. Although this does not affect the performance (at least in the simulation), I am just curious to ask if there is something missing or wrong in the schematic? Also, conjuration on reaching the 50K mark!
All the boards I built run the IPS at the designed 2.4ma. 1ma would reduce the slew rate. Are you using the latest schematic? Early in the project, the current was too low (1.2ma).
can you test it with square tone? to see how good the amplifier is. thinking about the rise of time or what it's called. One on youtube test l15 amplifier against a clone amplifier and in this way he found out that clone amp was not that good. thinking of (michael benny) youtube
Not world-class layout by any stretch. Cramping components is not always the answer. I would like you to compare the PCBs thoroughly in order to establish the performance of the layout. Secondly I want to see Eddy's simulation comparison. IMD is an important measurement to compare.
2nd try. First upload got a copyright content match so I had to edit and upload again. Anyhoo, it's been almost 4 years since I started this project. I wasn't in any hurry so it's good to call it done. Next, I want to collaborate on a power supply for it. That wont take long (I hope).
It was an amazing journey, informative and exciting. Thank you John!
Switch Mode Or Transformer?
Been fun following along with the journey from the far North.
I have two boys that look like Snickers, we felt your loss.
Oh Mang.! this is looking just wonderful, Proud of you Mang" this Jat will never Jat its Pants, well done, I sincerely mean that. much Jat in the Hat love from me here in Dunedin N.Z May the Jat be with you Mang"
can u add some pdf file of the pcb so we could make diy pcb , jlc or pcbway shipping cost too high for me.
What a nice coincidence, finalising the JAT amp project and passing the 50K subscribers milestone.
At last your JAT501 project has completed. And the main thing is all necessary files and documents are free on RUclips. It's very hard to find a good quality audiofile design with all details. Really hats off your efforts and contributions sir, 🙏🙏thank you.
Hott Damn John, you did it!!! Thank you. I'm downloading your files and going to place an order today. Congratulations on your 50k. Well deserved, my friend.
Thanks John , I've learned so much from this project. Congrads on 50K.
John, truly a pleasure watching you create, modify and build this amplifier. A great learning experience .
Hey thank you very much for making the files available, i have really enjoyed the series. Congratulations on the 50K milestone. Take care.
Finally got my in-line JAT501 boards built up and mounted on the heat sink. Hope to get it powered up soon. Fun little project
Congrats on the 50k! Well deserved!
Thank You John, I have really enjoyed this journey!
Thank you very much sir for making this available for free
Congrats John!! I really enjoyed following your journey!
Congrats on the conclusion of the project and the 50k!!! You deserve more for sure!
Congrats on 50k. I love watching your stuff. Thanks for all the work you put into it.
Happy 50k ! ..Thumbs up for your channel John. Enjoying the content, thanks for sharing.
Congrats on the 50K!
Love your work, John. Very much. I can’t wait to build one. You should maybe think about some way for us to share back with you what we’ve built with your design. Roll on the next one!
Hey John, As a long time loyal sub, Thank you for all the years of great content. It's about quality, not quantity in my book. Been very busy with work and life lately, trying to keep up. Very nice work on the JAT501. I hope you and yours are all doing well. Winter is basically over, Happy Spring. Getting nice in Oregon. All the Best, Cass.
Sepultura!! rrrrRRRROOOOTTSSS! 😆 congratson 50.1K subs :)
Congratulations on 50k subs! 🎉
Well done! Thanks for all your hard work on this project and congrats for 50k subs
Congrats John...cheers.
I jumped out of my chair at the sound test!🤣🤣🤣🤣🤣 I was not expecting that!!!
I wonder if that band does a cover version of the intell jingle?
Thanks for everything,
It's very interesting to watch your videos and stuff, I have learned many things from you,
Hopefully you'll get 100k subscribers sooner than ever, 🤗
I have loved watching your channel grow such interesting content and a nice guy. My best regards chris
Thanks john
Congratulations love the channel.
I liked the sepultura you were playing.
Excellent project, thanks so much for all the hard work you put in to these videos
Well done!
Well done John. An interesting and informative project, thank you.
Thank you.
Slot 1 CPU Pentium II/III cooler, brings back memories
I like your channel.
Keep going on 😍😍😍
Great job
Hi John, if you can provide another set of component value that make even lower distortion, I guess lot of people here can did the comparison for you. Also if you have time, maybe try to measure the different between finished PCB and the perf board, the different in the performance may give a hint on future design.
That is rather a tall order.
Intel slot one heat sink. Takes me back.😁
It would be great if you would compare it tda7294. The distortion characteristics is excellent. And later may be a square wave test.
grats on 50k
How much is gain margin , phase margin for this amplifier??
Gratulations John with the 50 k Is it one dollar for each 😃
Hey John, I noticed that on the the schematic, VR1 (200 Ohm trimmer resistor) has no wiper connection. There are 4 holes for this component on the inline board. How should a rectangular trimmer be oriented with these holes?
I want to build a 4 transistor amplifier to drive an 8 ohm speaker for a portable record player that uses a ceramic type cartridge, do you have any recommended circuits?
Hi! Sir pwede po ba ang 60 - 0 - 60 VAC supply dito ? Kung hindi anu kaya pwedeng baguhin sa parts or components? Salamat po 🙏
Good work. But old board never powered up before? Never tested?
John you need to do a audiophile version but not technically but from what you hear. Cause we can hear more than a single parameter of measurement but multiple.
John, do you think using silver mica in place of ceramics would make any sonic difference?
The ceramics are only for supply bypass so wouldn't make a difference if you're asking specifically about the JAT501.
Hello.! Congratulations sir, thanks to your video I've learned a lot, ❤️
Btw I wish to know where to buy the components you've used for this project, thank you and God bless ❤️
🇵🇭
there are many who collect on old processors! you should give it away to a retro channel instead of destroying it
Hi John. Do you think some day you could do a test & review 0n the TDA7498E DC 15-36V 2 Channel Audio Stereo Digital Power Amplifier Board 2*160W, available on ebay for about $25.00? Also would like to know if it's bridgeable. I am impressed with the JAT 501 and would like to buy some boards from somebody. I'm almost 70 and I'm not versed on how to use GERBER FILES at all. If someone has one or both boards or even a kit I would be interested in making a purchase.
I have a 7498E board in for review. Nothing needed to do with the gerber files other than sending them in to the PCB fab shop and they will make the boards for you.
@@JohnAudioTech Ok that's great, but I still have no idea how to send the request to I don't know where. Sorry to beat a dead horse but I'm totally ignorant about designing circuit boards or drawing schematics with a PC.. My schematics are hand drawn as in the old days. I wish some one could provide a course for dummies on these through YT or suggest a book to use along with the course. Still, I learn a lot and enjoy watching your vids.
@@voltagefreak6350 In the description of this video is my email. Contact me there and I can help you.
Hi John. I am following up on your JAT501 project. I am also following on Eddie of Kiss Analog. I have putting the JAT501 into the Micro Cap simulator. From that I found something something in question. The bias at the IPS (the long tail) is only about 1mA instead of 2.4mA as you've mentioned sometime before. Although this does not affect the performance (at least in the simulation), I am just curious to ask if there is something missing or wrong in the schematic? Also, conjuration on reaching the 50K mark!
All the boards I built run the IPS at the designed 2.4ma. 1ma would reduce the slew rate. Are you using the latest schematic? Early in the project, the current was too low (1.2ma).
Hi John. Thanks for your quick reply. Now I found the issue. I missed R11 in build the schematics into Micro-cap. Problem solved!
Hey John! I noticed that the VAS transistor gets a little hot… is that expected?
Yes, they (Q7 & Q9) dissipate 200 to 300 mw depending on supply voltage. They should not get too hot to touch though.
@@JohnAudioTech it seems about right then. Thanks for the explanation!
Sepultura for the sound test 😂
I'm getting tied of hearing that bench PSU only goes to 32V I feel like I'm missing out on max output. 100W or bust!
Why the vas stage was so hot when powering into 48 0 48 dc?
Because it's designed for +/- 35v
And i try now to powering it into +/- 24 volts dc still the transistor heat quickly
The base to emitter voltage of bd139 and bd140 not the same ,pls reply 😢
I think im the first one who try to make this circuit but i failed 😢
@@djgebhartmmc3265 Check currents in the circuit. What is the output voltage?
can you test it with square tone?
to see how good the amplifier is. thinking about the rise of time or what it's called. One on youtube test l15 amplifier against a clone amplifier and in this way he found out that clone amp was not that good. thinking of (michael benny) youtube
Nice.
Why make your design, though?
Not world-class layout by any stretch. Cramping components is not always the answer. I would like you to compare the PCBs thoroughly in order to establish the performance of the layout. Secondly I want to see Eddy's simulation comparison. IMD is an important measurement to compare.
Check the That300, That320, That340 ic's. matched transistors, suitable?
2n5401 = Obsolete @ mouser.