This circuit was found in Motorola's 1968 documentation. The SCRs are then replaceable with current equivalents. The lamp is 24 V according to the power supply.
May 2017 - Vishay's new AC0x..CS series safety wirewound resistors can now be obtained from Mouser...
Found in an American documentation from 1969, this circuit operates at a frequency determined by the...
This differentiating circuit applies to any operational amplifier. It operates with the negative...