This circuit is from 1994, from a technical documentation from National Semiconductor, but can be adapted to work with more modern components.
This circuit triggers an LED when the voltage reaches the level set in R1. The circuit does not...
We found this circuit in a 1977 Radio Shack brochure. Transistors can be the most modern BC548 for NPN...
This three-digit counter (up to 999) was found in documentation from the 1990s. It uses TTL...