Thank you so much. I have had my electronics lab since I was 12 years old. Now I'm 54 and I still have my electronics lab. I'm building this. I want to be able to charge my watch and Bluetooth earpiece. And yes I did build the Christmas tree from Amazon 🎄. That was a fun build.☺️☺️☺️ I so miss Poptronics Magazine formally Popular Electronics magazine. My heart is broken 💔.
This video contained exactly the information I was looking for. I wanted to power some IR LEDs for a head tracking device, but my "button operated" power bank kept switching off. However rather than building a circuit, I went and bought the cheapest power bank I could without a button, and it works as 5 volts is being constantly delivered. There is not enough current to turn on the discharge LED, which for my application is a benefit as I don't want any unnecessary LEDs near the head tracker. I am powering 3 IR LEDs in series with only 2mA, so a single charge of the small 2000mAh power bank is going to last a long time.
Since the timer requires constant power itself, using the CMOS version of the 555 could be quite beneficial. It uses a tiny fraction of the power the standard 555 needs.
Hi Paul, yes that's true and I could also leave out the power on LED to save 10 mA however in the scheme of things with a 20Ah battery pack it is fairly insignificant but I appreciate your comment.
Question 1: Can we simplify the circuit eliminating the transistor Q1 and connecting the 555 output directly to ground via a well selected resistor in a way to not exceed the maximum allowed current through the 555 (200mA). It will not be able to pulse high power, but it will be enough to keep a power bank awake (let's say choosing a resistor to allow 50mA or 100mA only)? Question 2: What is the purpose of C2 capacitor in your circuit? Thanks
Do you have any pictures of what the bottom of the board looks like? I saw only one picture of the board and a daigram on your website, but not the bottom part. I'm not that professional at reading circuit diagrams.
Ok, I figured out that problem, I used 270ohm and 390ohm vice 270k ohm and 390k ohm. With that it now has the blue light flashing with the cycle, but after about 30 seconds the LEDs turn off. Does this method require some sort of draw? I ask because the only thing I have plugged in is the bypass.
Problem solved, once again it was my error. I again used the wrong resistor, I used a 47k vice 47ohm and now it has been on for about 2 hrs. Thanks for the video.
Ok, so I thought I had it figured out but unfortunately it still shuts down. I have made it to around 2 hrs but then it shuts down. I have read that the resistors are based on the USB power bank, is there a different combo I need to apply? Thanks for any help you can provide.
Just change the sense resistor from 0.1R to 1R, and it will stay on if you just one port on your bank you can have one on constant and one on timed anyway that what I have done
quick question graham, do you still have your M50, if so i think i may have found a focusing bug, originally i found it in mine so i bought a second one so i would have a camera while mine was at canon but the second one which is virtually brand new also has it. neither camera can focus when there are only horizontal lines in the frame ie a gap in a chest of draws or a black horizontal line on a white background will also show up the problem. its only when there are horizontal lines in the frame, any other objects and the camera will grab them. if you do still have your camera i would appreciate a quick test to see if its just bad luck or part of a bigger picture. Thanks
Thank you Graham, that's exactly what I needed! Could you (or anyone) explain the purpose of the R4 (1k Ohm) resistor in your circuit? It works perfectly without, but maybe it's for saving energy?
Actually, if the purpose of the added circuit is to trick the power bank into detecting a load, then use your cellphone as the load by playing music or view a RUclips movie while charging at the same time. I have done it and it worked.
This is an unnecessarily complicated circuit. I have shorted the timer lead coming out of the IC and it works OK. It does not consume any extra power. The timeout circuit is there for a purpose as not to waste power.
Auto USB female outlets often have built in circuitry to provide 5.5V from a 12 -14 V input. I found one on ebay, so now I can charge my phone while riding my older motorcycle!
Xiaomi Portable Chargers,. not sure the models, have a low charging setting. You just quick press the power button twice and you will see the power level indicator lights change flashing pattern. I have LED circuit board lights that I like to use camping and power outages. The have very low settings that cannot be maintained by other power banks. The Xiaomi remain powering the LED lights, they will not shut down until drained or you press the power button once. They are high quality.
I ain't no electronic technician man. they're supposed to charge small items like wireless earbuds, yet they all shut off during charging. must be an easier way-?
Thank you so much. I have had my electronics lab since I was 12 years old. Now I'm 54 and I still have my electronics lab. I'm building this. I want to be able to charge my watch and Bluetooth earpiece. And yes I did build the Christmas tree from Amazon 🎄. That was a fun build.☺️☺️☺️ I so miss Poptronics Magazine formally Popular Electronics magazine. My heart is broken 💔.
This video contained exactly the information I was looking for. I wanted to power some IR LEDs for a head tracking device, but my "button operated" power bank kept switching off. However rather than building a circuit, I went and bought the cheapest power bank I could without a button, and it works as 5 volts is being constantly delivered. There is not enough current to turn on the discharge LED, which for my application is a benefit as I don't want any unnecessary LEDs near the head tracker. I am powering 3 IR LEDs in series with only 2mA, so a single charge of the small 2000mAh power bank is going to last a long time.
glad for the inspired approach
Since the timer requires constant power itself, using the CMOS version of the 555 could be quite beneficial. It uses a tiny fraction of the power the standard 555 needs.
Hi Paul, yes that's true and I could also leave out the power on LED to save 10 mA however in the scheme of things with a 20Ah battery pack it is fairly insignificant but I appreciate your comment.
Hi, do you know of anything similar I van BUY and not BUILD :) thinking some circuit in AliExpress maybe
Question 1: Can we simplify the circuit eliminating the transistor Q1 and connecting the 555 output directly to ground via a well selected resistor in a way to not exceed the maximum allowed current through the 555 (200mA). It will not be able to pulse high power, but it will be enough to keep a power bank awake (let's say choosing a resistor to allow 50mA or 100mA only)?
Question 2: What is the purpose of C2 capacitor in your circuit? Thanks
You don’t happen to have the model number of the green “always on” power bank you showed do you? Thank you for the video by the way.
Do you have any pictures of what the bottom of the board looks like? I saw only one picture of the board and a daigram on your website, but not the bottom part. I'm not that professional at reading circuit diagrams.
Could a 1N4148 diode be used in this circuit, instead of the 1N4142?
hi! sir i want to know how to make that circuit,i want to apply my power bank,,,give me a circuit sir... thanks🙏🙏🙏
What would make the blue and white LED stay on continuously and the power bank still shut off?
Ok, I figured out that problem, I used 270ohm and 390ohm vice 270k ohm and 390k ohm. With that it now has the blue light flashing with the cycle, but after about 30 seconds the LEDs turn off. Does this method require some sort of draw? I ask because the only thing I have plugged in is the bypass.
Problem solved, once again it was my error. I again used the wrong resistor, I used a 47k vice 47ohm and now it has been on for about 2 hrs. Thanks for the video.
Ok, so I thought I had it figured out but unfortunately it still shuts down. I have made it to around 2 hrs but then it shuts down. I have read that the resistors are based on the USB power bank, is there a different combo I need to apply? Thanks for any help you can provide.
Wow !! that's great ! Thank you. Looking for this solution for many months..
Just change the sense resistor from 0.1R to 1R, and it will stay on if you just one port on your bank you can have one on constant and one on timed anyway that what I have done
Perfectly explained!
quick question graham, do you still have your M50, if so i think i may have found a focusing bug, originally i found it in mine so i bought a second one so i would have a camera while mine was at canon but the second one which is virtually brand new also has it.
neither camera can focus when there are only horizontal lines in the frame ie a gap in a chest of draws or a black horizontal line on a white background will also show up the problem.
its only when there are horizontal lines in the frame, any other objects and the camera will grab them.
if you do still have your camera i would appreciate a quick test to see if its just bad luck or part of a bigger picture.
Thanks
Thank you Graham, that's exactly what I needed!
Could you (or anyone) explain the purpose of the R4 (1k Ohm) resistor in your circuit? It works perfectly without, but maybe it's for saving energy?
It's to be nice to the transistor specs. Many circuits are for more voltage/current range and whatnot.
Thats interesting, does it act as a pass through for keeping single outlet power banks going?
Use an ICM7555 timer instead of the NE555.
Ich Wünsche Dir ein frohes und gesundes neues jahr 2021
Actually, if the purpose of the added circuit is to trick the power bank into detecting a load, then use your cellphone as the load by playing music or view a RUclips movie while charging at the same time. I have done it and it worked.
This is an unnecessarily complicated circuit. I have shorted the timer lead coming out of the IC and it works OK. It does not consume any extra power. The timeout circuit is there for a purpose as not to waste power.
Hi, i have the 32p20-so chip inside my powerbank, can you tell me wich lead to short to where?
Happy New Year! :)
Auto USB female outlets often have built in circuitry to provide 5.5V from a 12 -14 V input. I found one on ebay, so now I can charge my phone while riding my older motorcycle!
Xiaomi Portable Chargers,. not sure the models, have a low charging setting. You just quick press the power button twice and you will see the power level indicator lights change flashing pattern. I have LED circuit board lights that I like to use camping and power outages. The have very low settings that cannot be maintained by other power banks. The Xiaomi remain powering the LED lights, they will not shut down until drained or you press the power button once.
They are high quality.
Can I use an bc547 instead of the 2n2222 transistor? Thanks!
Yes its the same principal
@@GrahamHoughton12 Thank you so much for your feedback!
I ain't no electronic technician man. they're supposed to charge small items like wireless earbuds, yet they all shut off during charging. must be an easier way-?
Every 4 seconds.