Found in a 1960 General Electric documentation, this crowbar circuit blows the fuse in case of excess current. The circuit is for 12 V sources triggering between 14 and 17 V.
Another interesting way of generating signals with small active cycles, that is, short pulses, is by...
Motors up to 2 A DC can be controlled by this circuit that we find in the manual for linear...
This light intensity meter is from a 1978 Texas Instruments optoelectronics manual. The...