Category: Main page » RF Circuits

2 Transistor Transmitter

Circuit : Rob
Email:   [email protected] Dutch only please!
Web:   Rob"s home page
Notes:   Andy Collinson

A compact 2 transistor transmitter for use at VHF frequencies.

2 Transistor Transmitter

Transistor T1 works as an audio preamplifier, gain is fixed at approximately R2/R1 or 100 times. The audio input is applied at the points LF in (on the diagram). P1 works as gain control. After amplification this audio signal now modulates the transmitter built around T2. Frequency is tunable using the trimmer CT and L1 is made using 3 turns of 1mm copper wire wound on a 5mm slug. The modulated signal passes via C6 to the antenna. A dipole can be made using 2 lengths of 65cm copper pipe. A DC power supply in the range 3 to 16 volts is required.


This page no comment. You can be the first.

Your name:
Your Email:

Type the characters: *