555 Switch Debouncer
h-circuit-debouncer-555.jpg
http://ecelab.com/circuit-debouncer-555.htm
Event Interruption Detector
h-circuit-event-interrupt.jpg
http://ecelab.com/circuit-event-interrupt.htm
Frequency Meter
h-circuit-freq-meter.jpg
http://ecelab.com/circuit-freq-meter.htm
Light-Controlled Oscillator
h-circuit-light-oscillator.jpg
http://ecelab.com/circuit-light-oscillator.htm
555-based Metronome
h-circuit-metronome-555.jpg
http://ecelab.com/circuit-metronome.htm
Missing Pulse Detector
h-circuit-miss-pulse-det.jpg
http://ecelab.com/circuit-miss-pulse-det.htm
Voltage Stabilizer
h-circuit-stab-series-var.jpg
http://ecelab.com/circuit-stabilizer-series.htm
555-based Touch Switch
h-circuit-touch-555.jpg
http://ecelab.com/circuit-touch-trigger.htm
555-based VCO
h-circuit-vco-555.jpg
http://ecelab.com/circuit-vco-555.htm