We found this circuit in an 80's manual. The same configuration can be adapted to make use of modern operational amplifiers. The power supply is symmetrical.
We found this circuit with unijunction transistor in an old publication from the 80's. The circuit...
This simple emitter can be used in animal conditioning, to scare animals and even in biology...
Found in an older Radio Craft, this circuit covers the aerial band from 118 to 136 MHz. No...