This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current can be between 50 mA and 300 mA and the voltage between 6 and 9 V.
The original application of this 1967 Ferranti circuit can be changed so that it functions as a pass...
The purpose of this modified astable is to make the initial pulses have the same duration as the...
This simple photometer was found in a 1977 Radio Shack manual. The sensor is a photocell, which can...