Found in a 1980s German publication, this circuit tests batteries by type. The circuit is based on a range of LEDs of different colors and is given a table with indications for various voltage ranges.
This simple test for general purpose NPN and PNP transistors was found in a 1974 publication....
In the bridged configuration the TDA2002 amplifier can supply 30 W of power at a load of 4 ohms...
This transistorized shift register was found in a 1970s RCA documentation. The used transistors can...