Her is my relay schematic

[skyboltone]

Well, I just threw the 7806 overboard. There just isn't enough headroom on a 5 volt transformer after the diode losses. I now get 7.9 volts recified and filtered (2200u), 6.2 volts w/ one relay and led, 5.9 volts w/both relays and leds. Brute force regulation. Works for me. Oh, I'm using 6VDC/40ohm relays.

YMMV
Dan

[tictac]

I found the same result with a regulator, ended up using a 6.2V zener diode on the output of the power supply. Works better than using a regulator when you're tapping off the 6.3V supply, like you said not enough headroom.

TT

[Tdale]

What is meant by "headroom" in this case?

I'm planning to use the unused 5V rectifier heaters for relay supply. Will I have a problem with that?

Tommy

[d95err]

What is meant by "headroom" in this case?

I'm planning to use the unused 5V rectifier heaters for relay supply. Will I have a problem with that?

Tommy

Headroom here would be the unfiltered DC level after the rectifier. A voltage regulator needs a bit more than the rated voltage to maintain a steady output voltage. E.g. a 6V regulator may need something like 7-8V unfiltered get a steady 6V output.

When using a 5V transformer tap, the resulting unfiltered DC may be too small to get a steady 6V with a 6V regulator. Using a 5V regulator would probably work though. The 6V relay can probably accept 5V.

Of course, using a 5V relay instead of a 6V would definately solve the problem.

[Tdale]

OK. I have a 5V relay, so I should be ok then...

By the way...swedish?

Tommy