W0JEC’s Projects

 

Parts:

Picaxe U.S. distributor:  PH Anderson, Springfield, VT (phanderson.com/picaxe).  This website offers the Picaxe 18M2 chip, the ULN2803A darlington array chip, 18 pin dip sockets, and a 5V 7805 regulator kit.  (May now only offer Picaxe chip.)

 

Digi-Key:

      Darlington array chip, ULN2803A, 18 pin: Digi-Key # 497-2356-5 ND

Note:  this darlington array chip is rated at 500 milliamps for each device (relay) attached.  This should be more than sufficient for any relays chosen for control of station accessories.

 

Radio Shack: (Alternate (and possibly cheaper) sources for these parts are Digi-Key or Mouser Electronics.

 

7805 5 V regulator, RS# 276-1770

1N4004 1 A rectifier diode, RS# 276-1103

47 mfd, 50 V. electrolytic capacitor, RS# 55047850

0.01 mfd ceramic capacitor, RS# 55047626

22K resistor, 1/4 watt, RS# 271-1339

10K resistor, 1/4 watt, RS# 271-1335

150 ohm resistor, RS# 271-1109

18 pin dip sockets, RS# 276-1992

DB9 female solder connector, RS# 276-1538

1/8" Stereo jack panel mount, RS# 274-249

1/8" Stereo plug cable, male/male, RS#42-223

12 VDC SPDT relays according to need

Project board and project enclosure

Other connectors and/or devices needed to connect 12 VDC relays to the board

 

 

Schematic of the Station Control/DST-4/6 Circuit Board