Suggested by Texas Instruments in 1968 documentation, this circuit uses components from the era. Modern diacs and SCRs can be employed.
This circuit was found in a 1980s English documentation. It is intended for old xenon lamp...
This alarm circuit triggers when S1 opens. The circuit from a January 1975 Radio Electronics...
Figure 1 shows how the 4029 can be connected to count up to 10 and also up to 18. If pin 9 is...