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simple circuit board construction and supply the following parts B1: Filament type incandescent buib1 6.3V .075A type 7377 (Ballast & current limiter.) Relay: 5', 50 coil, PCB mount DPDT; Selecta Switch SR15P207D1. D3 & D4: Zener Diodes, 18V 2 watt NTE 5027A. R5: 100k2 watt linear potentiometer; Caltronics P-68 or equiv. LED I & 2, combined as Bicolor red & green In same housing, Radio Shack # 276-012 SW2: "Test" SPST momentary on submlniature push-button, Radio Shack # 275-1571 Do not expect this device to function optimally If ANY electrical changes or ego Improvements are attempted. 7555 CMOS timer chip (generic) IC1 $1.80 100 k ohm 3 watt 5% resistor R 1 .07 1 meg 3 watt 5% resistor R 2 .07 2.2k 3 watt 5% resistor R 3 .07 1 k 3 watt 5% resistor R 4 .07 100k linear taper pot, ½ watt Caltronics P-68 R 5 2.56 200 F 20 V (or higher) electrolytic capacitor C 1 .45 0.22 F 20 V (or higher) Tantalum capacitor C 2 .25 1N4001 diode 2 required @ .15 D 1 & D 2 .30 18Volt Zener diodes, ½ watt, 2 @ .79 D 3 & D 4 1.58 (NTE5027A) NPN Transistor, generic 2N2222 Q1 .30 Bulb, 6.3 V .075A type 7377 B1 1.34 Relay, 5 V 50coil PCB Mount DPDT Selecta Switch SR15P207D1 5.45 Misc. wire, solder, etc. .50 Bicolor LED red/green Radio Shack #276-012 LED 1 $ 1.19 Jack for electrode leads 274-251 #/$1.59 J 1 .53 DPDT switch, 275-626 or equiv. (Used as DPST) SW 1 2.55 SPST Submini momentary push button switch SW 2 .59 ER-SW101 “Test” Battery Holder, 4-AA cells, Radio Shack 270-383 1.29 4 Alkaline AA cell batteries, #23-552 4 for 2.89 3 Alkaline 9V batteries, type 1604 etc. 3 for 3.75 3 9V battery snaps (clip-on connectors) #270-325 pkg 5/$1.29 1.29 Box, if used 2.29 Above items generally available at local Radio Shack Stores Lead wire with 3.5 mm plug, 6 ft., Mouser or Calrad Electronics .35 Electrodes, stretch elastic, Velcro, cotton flannel, alligator clips, etc ± 5.00 (See Notes) Total Cost for all components for do-it-yourself project $ 49.24 This design is basically a 7555 IC timer chip set for 50% duty cycle and ~3.9 Hz driving a subminature relay. Electrode polarity continually reverses ~¼ second positive / ¼ second negative. Frequency is not critical.