5W Amplifier with LM383 (CB25309E)

This circuit for the car was found in the April 1990 Radio Electronics magazine. The speaker is 4-ohms.

Telegraph Oscillator (CB6475E)
This small Hartley oscillator uses an output transformer for transistors. The frequency is...
Experimental Telegraph LM3909 (CB14287E)
The short-wired circuit is suggested by National Semiconductor in documentation on the LM3909. The power...
Overcurrent FET Oscillator (CB13121E)
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...