Author Topic: FM transmitter. take current dunt transmit  (Read 941 times)

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Offline dave_j_fanTopic starter

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FM transmitter. take current dunt transmit
« on: September 10, 2016, 05:19:24 pm »
i took this small and handy circuit :

http://electronics-diy.com/solar-powered-long-range-fm-transmitter.php

but when powerd from 9v cell it is not sending any xmission ... is the schematic ok ?
i feel like the trimmer from OSc is at wrong place

how do i debug it ?


it will be part of walky talky for a low range like 100m

 

Offline Audioguru

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Re: FM transmitter. take current dunt transmit
« Reply #1 on: September 11, 2016, 12:28:17 am »
Your circuit assembly is missing all the important capacitors.
The coil L1 connects from the oscillator collector to +9V and the tuning capacitor connects from the collector to ground. But at 100MHz the +9V is the same as ground so the tuning capacitor and coil are  parallel.
 


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