In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The circuit is by Philips from an old documentation.
This circuit is very critical in the adjustment. The coil should have at least 1000 turns of fine...
By pressing and releasing PB1, only one LED is lit, drawing a number from 1 to 6, as in a die. The...
This electromyography monitor is from a 1978 publication on operational amplifiers. The components are...