Found in a 90s R-E Experimenter Handbook, this circuit has a greater gain than the previous one for presenting two stages. The integrated circuit used is uncommon today.
Found in Popular Electronics, this configuration can be powered by voltages from 6 to 12 V....
This circuit was found in a 1966 General Electric book. The triac and the day are from that time...
Found in Philips' 1967 documentation, this circuit makes use of period components. The SCR can be...