The Commando Transmitter by Dave Martin.

The "Commando" is the higher power,high level modulated version of the "Corsair"
and was designed by Dave Martin in 2003.
Below is the original test circuit for the basic 48M version.

Click on image for full size.

See the original post for more details on the circuit and alterations needed for other bands. Dave Martins Corsair and Commando TX's: The Commando Transmitter by Dave Martin.

Corsair II

An update on the original Corsair circuit which can be found here, The Corsair TX.

Dave Martin.
 

Experimental Gate modulated 48 Metre transmitter

Below is a experimental variation of the Corsair circuit. Instead of series modulating Q2 and using the final Q3 stage as a linear the gate of Q3 is modulated by by the output of IC1 the LM386.

You must use the 7808 voltage regulator otherwise the voltage to the gate of Q3 will exceed the safe level and destroy it.

If you already have a Corsair built, altering it to this circuit is easy.

If you build this please leave a comment letting me know how it went for you.

The original Corsair circuit is HERE.

 Click for full size

Below is a video of what a test transmission from the above circuit looked and sounded like received locally.

Dave Martin.

Toroid Ready reckoner

Ever needed to know how many turns on a toroid will give the required inductance?

Well below is a Ready Reckoner for just such occasions.

 Click on picture for large size.
Or right click to save.

Dave Martin.

Compressor limiter circuit

Below is a circuit for a limiter compressor that can be used with any transmitter.

If not being used with the series mod just omit everything after C15 around the U1:D section.

Dave Martin

50 Watt Class E AM TX for 1476

Dave Martin.

The Corsette Low power SW Transmitter.

The idea behind the Corsette was to come up with a simple QRP AM TX for 6 to 7 MHz, that could be built in a very short space of time.
The circuit below is basically the first 2 stages of a Corsair,it must be noted that there is no low pass filter on the output. You should add one as even at these low powers harmonics can be a problem.A suitable filter will follow.