This 1968 Mullard circuit detects fire by smoke using LDR-type sensors. The circuit makes use of transistors of the time that admit equivalents.
This circuit makes use of an unusual component which is a large surface diode that can be used to...
This circuit for voltages up to about 20 V was found in a 90s Popular Electronics. The LED can be...
This circuit is both simulation of the operation of a diode bridge and a test circuit for this...