Intermittent Oscillator or Siren (CB18276E)

The basic siren configuration shown in figure 1 activates a piezoelectric transducer and can be used as an alert or warning device.

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Diodes and Transistors Tester (CB1531E )
This simple circuit, obtained from a Radio Shack documentation, tests transistors and diodes. The...
555 and 741 Tester (CB18746E)
This simple circuit is intended to test integrated circuits 555 and 741 in 8-pin DIL enclosures. In both...
Infrared Control Receiver (CB24830E)
This is a circuit for receiving signals from the previous transmitter. The circuit uses a common...