We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is not pressed to reset.
This digital / analog converter shield is suggested by MOTOROLA and is based on an operational amplifier...
This circuit is from a 1974 Ferranti transistor manual. The circuit is analog, and the components used...
A low voltage heating element (up to 30 V) with a current of up to 3 A can be precisely controlled with...