The circuits below lights a 20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less.
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two “1 of 8 line decoders” (74HC138 or 74HCT138) to generate the popular “Night Rider” display.
The circuit below uses a hex Schmitt Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers (74HCT164 or 74HC164) to sequence 16 LEDs.
Here is a 12 volt / 2 amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a astable 555 timer oscillator.
In this circuit, one, two or three neon indicator bulbs can be made to flash in sequence at rates determined by the R and C values.
This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs.