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An inproved version of the circuit CIR129E is shown here. The resistorR1 must be at least 5 times...
For the low channels (2 to 6) the coil is formed by 5 turns of wire 20 or 22 in a form of 1 cm...
Found in an EDN from the 1980s, this circuit uses a double 555. The circuit activates a relay that...