Asked by JJK6 in Circuits

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need info regarding replacement items in circuit..... Answered

Hi guysI am trying to build a three stage fm transmitter and for the life of me I cannot find a 5-20p trimmer cap anywhere as well as the copper tinned coils...what can I replace the trim cap with.....a cap with a different value? and what can I replace the copper tinned coils with....normal 18 gauge wire coil?..any help will be welcomed

Tags:transmitter

Comments

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4 years ago

I would use a plex fine screw to lower or raise a Cu/Beryllium spring plate against a PCB Cu trace. But i don't know the ranges of the round rotating parallel Al plates...

4 years ago

Show a circuit and that would be helpful to decide what the components are doing.

i guess the trimmer cap is tuning so if you use a different value you will effect the tuning range unless you compensate by changing the coil

4 years ago

iceeng

Laymens terms please .....would you not use a trimcap?

Answer 4 years ago

Sure, but you said that you wanted to replace one.

Click the pic to see the whole image..

4 years ago

https://www.instructables.com/id/air-variable-capac...

another option, make one. Although I would try what you can get as I said the tolerance on vairable caps is huge.

4 years ago

here is the circuit and yes the trimmer cap is for tuning

4 years ago

https://www.amazon.co.uk/Capacitor-Trimmer-4-5-20p...

amazon have the trimmer cap, slightly less but the tolerance on these is huge so it should be OK. The tinned wire can be plain copper.