Capacitor Tester Circuit Board Release With Assembly Instructions.
Added 2018-04-16 05:39:19 +0000 UTCClick the large black title above this sentence to expand this post ^
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Here are all the files to get you building!
This is the circuit board for the thru-hole LM3915 version. It now tests Mica's, Electrolytic's, and other "devices" for leakage resistance. The LM3914 thru-hole and surface mount version's are in the making right now.
Please note: With extremely slow LED movement, some light bounce (back and forth) is to be expected.
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See below for attached files.
Comments
update from previous post asking about controlling voltage across test dut to test caps rated at lower voltages than 28v. I had apparently assumed that i could use grd at another point other than across .001 cap i than tried reversing diode which blew it i did not notice and continued my fail to create 2 more lower voltages settings 10v 16v in my build using on/off/on switch to allow 3 voltages including 28v in off center position of switch. I hope this helps others, feel a little foolish i am usually better at spotting the issue and this is the first time i have ever asked for help to solve a issue. thank you Mr. Carlson for this fantastic circuit definitely getting used promently on bench.
Mike
2024-05-15 06:21:55 +0000 UTCHello, I have built this wonderful tester, advanced build 3915 thru hole version without switch to discharge caps and it works fantastic!! Thank you, Mr. Carlson. I am attempting to make it adjustable on voltage for less than 28v and have tried to use Zener diodes as pointed at 4:06 in video and i am wondering if i am supposed to cut trace or use a smaller than 10 and16v Zener. I am getting to small of a voltage output and i tried reversing diodes no luck i am certain i am in right place as best i can tell on board if anyone is seeing this could u show me a picture of what u have done to reduce voltage for small v caps. I am hoping to see on board itself the spot where to install Zener's instead of circuit diagram. I am a hobbyist without schooling and hope this isn't too much of a foolish waste of someone's time. I have tried to sign up for the forum but keep getting a forgot the password special temp password that does not work and i never did even set my own like other sites allow but i am a old man that isn't all that great with computers either. So, if someone is watching this spot and could post in the spot where there is some info about this project I will be checking. If not, all I can say is I still really really like this build and thank you Mr. Carlson wonderful.
Mike
2024-05-11 19:29:36 +0000 UTCCarrying on from my last post, I thought that I would update you all with what I discovered. After carefully rechecking components, I found that I had mistakenly installed a wrong value resistor. The resistor in question is the 220 Ohm connected between the variable resistor and ground. Somehow, I had misread the colour code and installed a 220k instead of the correct 220 Ohm. This caused the problem described above. it now works......sort of OK. The only thing that seems to be a problem is that when the LEDs count down to the last LED before the green LED, there is quite a wait before it extinguishes and the green LED lights. Not sure why this is happening. Any ideas? Just to add, this happens on new capacitors with no leakage.
Keith-DS
2024-01-25 20:56:42 +0000 UTCI have recently started in electronics and thought this would be a good project to take on. But I am also having a similar problem as Rodrigo Manzatto above. I have just finished building the board and if I try to test a capacitor I get the red LED light and the farthest right LED illuminates. After a short time the Red LED goes out and that's it, nothing else happens. I have tried measuring the voltage on the cap as it charges and when it reaches almost line voltage, the Red LED goes out. What doesn't happen is the LEDs do not 'count down' and light the green LED. Any advice would be welcome.
Keith-DS
2024-01-22 15:23:31 +0000 UTC
