This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR...
This circuit generates signals from 50kHz to 10MHz, depending on the crystal used. The transistors can be...
This simple light relay circuit was found in a 1988 documentation. The base is the operational 741 which has...