This is a simple tubed mixer from the 50's. The circuit does not include the power supply and has 3 inputs with independent controls. The tubes are double and the inputs are high impedance.
This circuit is one of many that the reader can find in this section for testing crystals. The...
This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid...
This sinusoidal oscillator is suggested by Texas Instruments' Linear Circuits Applications, using a...