What is a Programmable Unijunction Transistor (PUT)? Simple – it is a three ... The operation of this crude LED flasher circuit is obvious, if you understand the elements. This is a thrown-together ...

Aiming to create digital circuits from such things as relays, vacuum tubes, discrete transistors, and occasionally diodes, they come up with designs that use ... an ultra-simple LED flasher.

Aiming to create digital circuits from such things as relays, vacuum tubes, discrete transistors, and occasionally diodes, they come up with designs that use ... an ultra-simple LED flasher.

Note; there is a flasher version ... by turning the pnp transistor on, which in turn holds the npn on for a bit (the npn otherwise loses base drive as the cap voltage drops below Zener+Vbe volts). As ...