Here are some DIY FM Transmitter circuits that we have been published on ... This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a ...

When we think of a spark gap radio transmitter ... energizes the tuned circuit, with each pulse causing a damped oscillation at its resonant frequency. The resulting RF signal is a crude AM ...

This remarkable development of RF circuits is chronicled in the first ... the attributes and limitations of various receiver and transmitter architectures. The material assumes a thorough ...

We say don’t try this at home because the output of a transmitter like this will likely spew RF all over the place ... more details about how the tank circuits work in those videos.

The frequency trimming can be done with VC2. The carrier is amplified by transistor T4 and coupled to RF amplifier transistor T1 BD677 through transformer X1. The AM radio transmitter does not use any ...