Found on a Radio Electronics this 80's circuit uses two common SCRs driving lamps. This setting appears elsewhere in this site and this section.
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...