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 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...