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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Charge the cap through a resistor? After one time constant the voltage will be 0.63 of the applied voltage. My only worry is that the value of the trimmer cap might be so small that your rise time of the charge voltage will be too fast.
Some series of trimmers are colour coded, and some have house codes on them, as mentioned the best way is to measure it.
You might get some idea as to what circuit its in, ie if its part of an xtal osc then it could be around 35pf.
Romans circuits work, I've never made the cap tester which looks dead simple to build, I've built others with success.
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