I have started to work on three modules for a school project, with the deadline of january 31st, but I ran into a problem.
I have recently finished building my first module, LMNC’s simple VCO with the square wave output and pwm. When i went to test it out i have had no signal coming out of the outputs.
I tried trobuleshooting but so far with no succsess. I have cheecked the power supply connections and I think there is no problem there. I tried wiring each of the outputs individually because I thought that maybe i have wired something wrong on the panel, but it didn’t work.
Right now I have how to fix it and I hope I haven’t fried the chips, even though there was no smoke or smell. Since I’m a beginner and have almost no idea what I’m doing, I really need some help!
Thanks.
BTW I didn’t know where to post this so I made a new topic.
If you are talking about the super simple oscillator there are a few threads.
TLDR; is usually just that you need to find the right transistor to get the oscillation. So try a bunch of them and see if that helps.
Yeah…not a lot of troubleshooting you can do without one, except looking things over. Even the cheapest one you can find would work. I used a $4 or $5 harbor freight meter for six months
Yesterday I tried to get an isolated triangle output(wich probably was not smart), but it still didn’t work. I think I did the cuts on the stripboard right if you mean the break ups of lines between the chip sockets. And yes it kinda looks all messed up because I tried to disconnect wire and reconnect them, etc. Also the resistors have different Wattage values because when I ordered the parts I didn’t realize that. And lastly I moved the power socket(don’t know what it’s called) to another spot. hope this helps.
Probably not the source of any of your problems, but it is recommended to connect your ground to all six power header ground pins, not just two of them.
Power is DC (it’s a flat constant value, plus or minus). Audio signals and some control voltages are AC (they oscillate above and below a central value), but the voltages mentioned in the linked posts above are DC.
There’s a couple other spots that look suspicious too but hard to say. Make sure you don’t have any solder bridges where you shouldn’t. There should be a mode called continuity on your meter you can check if you have a connection
Those two spots didn’t conduct but, i found another spot that did and fixed it. Also i’m had a thought that maybe my 3340 chip doesn’t work. How could i make a simple circuit to test if it works? but thanks for the tips everyone.
I checked how much power there is on the stripboard by measuring +12v and -12v connections,and on the multimeter it showed up as 10,06v, could that be the problem?
