LED Monitor for Stepper Motor Operation (MEC166E)

Figure 1 LED monitor.

Electronic doorbell (CB20646E)
This circuit is from a Popular Electronics from the 80's. The components used are not common...
Crystal Controlled Converter (CB26330E)
We found this Popular Electronics puma circuit from the 90s. Transformer T1 determines the...
Decay Oscillator (CB26102E)
This circuit produces a signal whose frequency decays from 500 Hz to zero in a time interval given...