This circuit was found in the June 1986 issue of Radio Electronics magazine. It is based on two operational CA3140s and has a trigger voltage adjustment.
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...
A NOR gate can be improvised using one NAND gate of a 4011 as shown here. The diodes are...
Found in the September 1982 issue of Radio Electronics magazine, this circuit triggers a relay...