Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per second. The transistor can be replaced by a modern equivalent.
This charger sources currents in three ranges: 10 mA, 25 mA and 50 mA; Current is sellected...
The LM11 is a precision operational amplifier from National Semiconductor. The circuit was found in...
This amplifier uses germanium transistors of the time. The circuit is from a documentation from...