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variable capacitor

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chikedef

New Member
can l use a tuning capacitor on the radio receiver as a variable capacitor on my FM transmitter. wat is the range of the capacitor that is tha max and min capacitance
 

k7elp60

Active Member
Yes you can. The tuning ratio of the the transmitter is generally the sq root of the capacitance ratio. The tunning ratio is the maximum capacitance/minum capacitance. If this ratio is 9:1 then the tuning ratio of the receiver will be close to 3:1.
 
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audioguru

Well-Known Member
Most Helpful Member
stray capacitance of the wires on the pcb increase the minimum capacitance of a trimmer capacitor.
 

k7elp60

Active Member
Audioguru is correct, one has to take ineffect the stray capacitance...especially at standard FM broadcast frequencies.
 
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