This circuit serves as an audio output for AM or even FM radios and was found in a Radio Electronics magazine from March 1990. Note the supply voltages.
With this circuit, of a 1977 Radio Shack documentation, it is possible to demonstrate the...
We found this circuit in a Philips documentation from 1969. It makes use of transistors of the...
This traditional triplier configuration with the 555 can be found in other articles on the...