Mark VI Field Controller Parts List Integrated Circuits U1- NE555 Timer, in 8 pin DIP U2- LM723 Voltage Regulator, in 14 pin DIP Transistors Q1- MJE 2955, or any PNP with Ic>5 Amps. heatsunk Q2- 2N2222A Diodes D1- Red LED D2- 18 Volt Zener D3 & D4- 1N914 D5- Yellow LED D6- 1N4004 D7- 1N1202A, or any 3+ Amp. diode, heatsunk Resistors R1, R5, R9, & R12- 1 K½ R2- 4.7 K½ R3- 100 K½ Potentiometer R4- 4.7 K½ R6- 3 K½ R7- 1 K½ Potentiometer R8- 3.3 K½ R10- 4.7 K½ R11- 100 ½, 10 Watts All resistors 1/4 Watt & 5% unless otherwise noted. Capacitors C1 & C7- 0.1µf C2- 0.047 µf C3, C4, & C6- 0.01 µf C5- 0.0001 µf All capacitors are 25 Volt rated All commercial rights reserved by Electron Connection Ltd. Any commercial use of this circuit is prohibited without express written permission from Electron Connection Ltd. Homebuilding of single devices, by the end user, is approved and encouraged without written permission.