9V battery-powered 555 timer LED blinker with on/off switch and hand-solderable through-hole parts. Uses a DIP-8 LM555 in astable mode with 47k/47k/10uF timing for about a 1 second blink interval, a 100nF decoupling capacitor, and a red 5mm LED with 680 ohm series resistor.

6x Warm-White 5mm LED Ring (2 constant, 4 flicker) on 4.5 V battery w/ high-side SPST and bussed 6x330 ohm resistor network

Breakout board for PCB-mounted 3PDT switch. Includes placement for 5mm status LED and current limiting resistor.