This circuit is from American documentation from the 1980s. The transistors are general purpose types and the relay can be 6 or 12 V depending on the supply voltage.
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
This circuit is from a 1992 PE Hobbyst Handbook. The circuit fires an old electronic flash using an...
An interesting point of this project is that it is used not only for a robotics project but also...