Pro's and Cons to DC regulated Filiment Heaters

[boldaslove6789]

Thanks for the insight guys.

Decided to scrap the DC heaters...

Going to use some Iso trafo's too. I believe I'm implementing this right?

[tictac]

Are you going for a FW Voltage-doubler?

I think yours needs a bit of tweaking; you've got the filter cap + grounded and the transformer is connected to the choke with no rectification.... see below

I think you want this circuit unless I'm mistaken...

TT

[boldaslove6789]

I have the Choke in series with the 15k 3w as per the Dumbleator II Schemo, and the transformer Secondary is going in between the Diodes in the Voltage Doubler. The Pwr transformer is a 230v wired in parallel @ 115, and a 12.6v Pwr trafo wired in parallel giving 6.3v for heaters.

[ecisthebest]

Thanks for the insight guys.

Decided to scrap the DC heaters...

Going to use some Iso trafo's too. I believe I'm implementing this right?

can you actually isolate the whole circuit from the other? haha

way you're doing it, you're separating the circuits by using green grounds and beige grounds. however, they both end up at solder lugs, and bolted to the chassis... that's not isolating anything. you can't bolt any ground to the chassis because chassis is connected to earth at the IEC jack... connect all of ground A to the sleeve of output jack A, and connect all of ground B to the sleeve of output jack B... you'd need separate power transformers for them too don't you?


if i were to do this, i would -read, you don't have to- share grounds for the circuit, then isolate just the output with the iso-transformers. haha

[rob@tele]

For the iso-transformers, look at their max voltage swing. The voltage swing at the input of the dumblelator can be quite high, way over 2 volts.

[bluesfendermanblues]

Your implementation of iso transformers looks ok to me.

However, given your friends planned application of the new double dumblelator unit, using two amps into one effects unit - why don't ya simply make two dumbleators instead and avoid ground loops all together??

All it takes is an additional chassis and a PSU.

You might still be able to 'share' the effects unit between the two systems, (especially if you use a couple of Suhr minimix II, which have isotransformers installed from the get go).

This will provide your friend with more flexibility...he can bring one rig to a small gig or a larger two-amp setup to larger gigs.

Having said that, I respect your innovation of the old dumblelator design.

[boldaslove6789]

Your implementation of iso transformers looks ok to me.

However, given your friends planned application of the new double dumblelator unit, using two amps into one effects unit - why don't ya simply make two dumbleators instead and avoid ground loops all together??

All it takes is an additional chassis and a PSU.

You might still be able to 'share' the effects unit between the two systems, (especially if you use a couple of Suhr minimix II, which have isotransformers installed from the get go).

This will provide your friend with more flexibility...he can bring one rig to a small gig or a larger two-amp setup to larger gigs.

Having said that, I respect your innovation of the old dumblelator design.

Well, the reason went with this idea is I needed to keep the cost down and only room for one rack space too.

Yeah I had considered mentioning the thought of Suhr MiniMix's , but AFAIK the Effect that will be used ( TC Electronics M2000) already has the ability to run the effect in stereo, and in in Parallel, with isolation, and TMK basically it has the same functionality as the MiniMix built in.

I'll take a try at it and see if the grounds will be an issue (with iso trafo's)

Thanks for all the help guys

[tictac]

Your schematic doesn't match your layout.... please look at it again

TT

[catears]

Just curious about why you want stereo in/stereo out in the first place?

Are you going to use (a switch into) Two preamps => stereo dlator=>two poweramps?

Yes its for a friend that needs to buffer two loops for two Seperate amps.

This is why I made the comment in the files section.

I know people don't think about the role of signal phase in the loop section, but if you are using 2 separate amps, and will be using at least 1 effect (possibly more) in each loop, you are going to encounter some situations where you wish you had the option to flip the phase on one side (pre or post effect) in order for the effect 'work'. If the amps have switchable FET, you flipping essentially before the preamp valves and adding the extra gain stage, which wouldn't really allow the same control you would need, and force you to tap dance one more step.

Also, the option to link by using synced dpdt relays and dual gang pots on one of the "channels" like a 2 channel rack compressor, it might cost 15-20 more to build, but say you want to use some piece of mojo stereo equipment that doesn't have modern mixing/bus features, and you want the ability to link on the fly without having to tweak the second channel in perfect, this would be a great solution. Phase options would be a major bonus to a sync feature as well if you want to get true leslie or chorus sounds in a stereo set up. It wouldn't cost that much more, nor take up very much real estate.