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 circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
The sensors in this circuit, found in a 1999 documentation, are stripped wire tips at different levels...
Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the...