9 V Battery Tester and Cell (CB15087E)

If the battery is good, the LED flashes. This simple tester uses an LM3909 integrated circuit. We found this configuration in an old documentation.

| Clique na imagem para ampliar |

Light controlled switch (CB22139E)
This circuit was obtained from an old English book. Transistors are types of the time....
Relaxation Oscillator Using PUT (MSB075E)
This is a simulation of a Relaxation Oscillator using a programmable unijunction transistor (PUT). The...
Megaphone (CB22487E)
Found in a 1999 documentation, this circuit makes use of a power germanium transistor and a...