We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as sensors and drives relays. The relays must have voltages according to the power supply.
The gain of this circuit is given by the value of R1 that depends on the current in the...
This hydromassage circuit was found in a 1967 General Electric publication. The SCR is according to the...
Published in 1988 in Hands-On Electronics, this circuit converts the 12 V of a battery into 120 V...