LED Monitor for Stepper Motor Operation (MEC166E)

Figure 1 LED monitor.

Schmitt Trigger (CB999E)
This circuit was found in an old publication about transistor. The original trasistors are...
Psychological Alarm (CB4658E)
This circuit keeps a flashing LED when a balcony lamp, for example, is turned off. As a result,...
TTL Two Tone Siren (CB4364E)
This circuit is from an English magazine from 1976. By replacing the transistor for a BC548, the...