This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a gas lamp of the time.
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...
The 1 kHz tuned filter shown uses a 741 op-amp. The components can be re-scaled to suit the...
This circuit was found in a 1977s English magazine. The SCR can be the TIC106 and the transistor the...