This modulator amplifier for transmitters was found in a 1947 American book. The circuit uses an output with 4 tubes connected in parallel and in push-pull.
Wien Bridge This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends...
This simple light meter or photometer circuit uses an analog indicator of 0-1 mA. Power is...
This very high input impedance circuit is suggested by Texas Instruments. The circuit can be...