ODS 5v winding for relays.

[Frankie]

I have a ceriatone OTS and I have changed the PT to a hammond 290DEX,
I will use the 5v supply from the PT to power the relays, but on the ceriatone tranny the relay taps are 6v and 0v, how should I wire the 5v-5v from the hammond? It doesn`t have any center tap, so I`m kind of lost here.

Frank

[Structo]

Usually the 5v taps are labeled as 5-0v.
A 5v tap does not have a center tap.
It was made to power a tube rectifier.

Does it have two yellow wires?

Here is a 5v relay supply.

[Frankie]

Usually the 5v taps are labeled as 5-0v.
A 5v tap does not have a center tap.
It was made to power a tube rectifier.

Does it have two yellow wires?

Here is a 5v relay supply.

They are both yellow wires.
On the tranny wiring they say 5v, 3A. noyhing about 5-0v.
It´s a hammond 290DEX Tranny.
I will try to solve the problem I`m having with my ODS 50w, that was changing the tone after 5 min playing. Had 7 pages here before if you remember. :) Finally got a new tranny to try this week.

[phsyconoodler]

Look at Structo's picture.The two yellow wires hook up just as shown.
Then you run the power to the relays.Done.

[Frankie]

Look at Structo's picture.The two yellow wires hook up just as shown.
Then you run the power to the relays.Done.

Thanks!
I`m always scared to do wrong and fry it, cause it takes 3 weeks to get a new one!
outch!

F

[phsyconoodler]

You have to remember to NOT use the regulator that's in the Ceriatone layout.It's not needed with a 5v supply tap.

Go to www.brown-note.com for a more complete layout using the 5v relays.

[Structo]

This is to only show the relay setup.

[Structo]

Yes the two yellow wires are the 5v supply.

[img:210:361]http://www.tubesandmore.com/cemirror/in ... wiring.gif[/img]

The easiest way to prevent frying your PT is to use a light bulb current limiter.
Start with a 25w light bulb and you limit the current to under 1/4 amp.

What happens if there is a shorts circuit, the lamp will remain bright so you turn off the amp and fix the short.
When things are right, it will flash briefly and then go down to a low glow.

[Frankie]

You have to remember to NOT use the regulator that's in the Ceriatone layout.It's not needed with a 5v supply tap.

Go to www.brown-note.com for a more complete layout using the 5v relays.

My relays are 12v dc, so I needed to use the regulator.
I measured 10.7 Vdc on my relays, and they seem to work fine with it.
But better, my amp sound much,much better with this tranny, and my problem with the change in tone after a while of playing is gone.
Yeah!
Thank you guys who helped me get it done!!

[Frankie]

Yes the two yellow wires are the 5v supply.

[img:210:361]http://www.tubesandmore.com/cemirror/in ... wiring.gif[/img]

The easiest way to prevent frying your PT is to use a light bulb current limiter.
Start with a 25w light bulb and you limit the current to under 1/4 amp.

What happens if there is a shorts circuit, the lamp will remain bright so you turn off the amp and fix the short.
When things are right, it will flash briefly and then go down to a low glow.

Yes very good, I always use that!

F

[Structo]

Wait, you have a 12v regulator?

[Frankie]

Wait, you have a 12v regulator?

That is right! 12v. Or doubler I think. It`s the one from Ceriatone.

http://www.ceriatone.com/images/layoutP ... ial-V2.jpg

Frank

[llemtt]

Glad to year the new trannie solved your problems

I build my amps with hammond power trannies and I am very positive about them.

I run my 5V relays from the 5v winding with only a bridge rectifier and a 4.700u cap and everything is fine, but you can run also 6V relays that way because there's enough voltage.

cheers
teo

[talbany]

If you plan on using the 12v relays your going to have to use the doubler 10v rectified 10x1.41 gives you 14.1 volts unloaded.. which should be fine.FWIW .Voltage doublers don't need CT's .. The coils in the relays are electromagnetically induced (inductor) so the voltages don't need to be dead on couple volts either way since you need just enough to energize the coil to latch the switch.. The regulator is a good idea and can't hurt espescially if you have a long footswitch cord with led's on them.. They also help prevent an excessive charge that can build up over the relay's coil or if you live in a place where your voltages are all over the place.. If you have it go ahead and use it..This is what I would do.. Good Luck

FWIW., Higher voltage relays take longer to operate.
Tony