This is one of the many modulated siren versions that can be found on our website. We found it in a Hands On Electronics from the 90s.
This bank of switches can be programmed in a variety of ways for logic experiments. The circuit is from...
This circuit is from a 1968 publication. Here we have several types of resistive sensors with...
This circuit was found in a 90s Popular Electronics. Both the coupler and the MOSFET can be of any...