This crowbar circuit for alternating current causes a quick fuse to blow when the load current exceeds a certain value. The circuit is from an American 80's documentation.
Figure bellow shows another circuit that allows adjustments in the duty cycle of the output...
This well-crafted speed game setup for two competitors was found in a 1998 Poptronics. The circuit...
This circuit produces a sine 1 kHz signal. The frequency is given by C1, C2 and C3. This is a...