Lee's project

[jetcone]

Lee

Mahalo for sharing! I have been trying to figure this out for the last 5 years! How did you get the 5 v Dc output from the PIC to trigger the 12 v DC relays?

Jon

 

[hotpoint95622]

Hi Jon

I have used BC337-16 low power NPN transistors which are protected by 1N4148 switching diodes have also put an LED to show when the output is active.

 

[jetcone]

OH ISNT THAT

SMART!
And the diodes absorb all the shock of switching the inductance loads!!
Is that a high wattage 1Kohm resistor in series with the PIC output?
Good you Lee, now I see where to go!
Thanks
jon

 

[Unimatic1140]

Jon, for the two relay boards that I had constructed for the Super Unimatic, I used a similar setup. I didn't realize that the part marked BC547 was an actual transistor! You know I prefer vacuum tubes :-D

 

[hotpoint95622]

Thanks

Resistor is ¼ watt 1 K metal film. Stops the relay making a humming sound.