Monday, September 08, 2008

Connection Diagram of DC PCB SSR

This is an Application note i used to give with my ssr - app012.pdf
Diagram of SSR 5000 DC 3-30 Control / 230V AC N.O. @ 3A.
This is a Thyristor Based Normally Open 230V Switch that can be turned on / off at a fast rate. This switches at Zero Crossover . Use 5V DC for Best Results.
PCB SSR Wiring
  • No moving parts hence no wear and tear.
  • Dissipates Heat when in On Condition 5 Watts @ 3 Amps.
  • Mount with adequate Air Ventilation for 3 Amps.
  • Dissipation is 1.4 Watts per Amp thru Load.
  • Input to Output is optically isolated 1kV.
  • This one is DC 3-30 Control AC 230V N.O. Output.
  • Off state snubber Leakage is around 1 mA.
Notes -
The Termination's of High Current Lines going to Load must be very tight and crimped. Loose contacts will Spark and cause Fire.
Fast Blow Fuse is to be used. Use a 2 Amps Fuse with Holder in the Hot Line.

Electronic Shift Monitor

The Security Guard duty monitor below, shown in eight circuits at Digital Circuits - 1 are examples of logic circuits, i have converted them from the DOS Orcad to Orcad 9 and corrected some errors a few years back.

Electronic Shift Monitor - delabs

These circuits can be used for looking at the logic blocks or to learn. This product was built and sold to some firms many years back. Now these designs are best done with a PIC or Atmel chip. Here is the user manual

This circuit was done with CMOS CD40xx type of ICs. A RAM was used to store the Day/Time LED Status.

It was to monitor the Alertness of the Security Guard. Periodically the Unit will Buzz and Flash and the Security Guard has to press a Big Button to indicate he is awake, alert, agile and around the Unit.

All Green means fine, few Red LEDs means the Guard was sleeping or gone away from some times. All Red means Security Guard is missing. :-)

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