The circuit is from a Radio Electronics magazine from October 1987. The Triac must be equipped with a heatsink and the transistors are general purpose.
The integrated circuit of this pulse generator is 4093 and the frequency can be between a fraction of...
The figure shows how to implement a stage with an emitter follower. The stage has high input...
This circuit is an improved version of the previous ones with the LM3914. We found it in the March...