Advice needed for Deluxe Memory Man and power supply.

[guitylerham]

Hey guys,
I am finally building the power supply for my multi-effect pedal and need an answer.  My DMM circuit traditionally uses a 24vdc wall wart (putting out around 30vdc) which is then regulated onboard the effect circuit to 15vdc. Since I am using a Weber xfrmr with 11vac and 9vac secondaries, do I really need to rectify all the way up to around 30vdc, like the wall wart puts out only to heat up another regulator that brings it down to a smooth 15vdc? I was told how to rectify either two 11vac outputs in series or double the voltage of one 11vac output.

From what I can tell, the DMM doesnt really use the 24vdc for anythig before it gets to the 15v regulator. Am I correct?

Also while Ive got you looking and thinking power supplies, the leslie sim I plan to use requires a smooth 12vdc. What would you guys use to get enough voltage in excess of that to power it sufficiently from the two types of secondaries at my disposal?

[DavenPaget]

1) I am very confused . What do you mean DMM circuit and then effect circuit ? A DMM on a effect circuit ?

[guitylerham]

Sorry, I was using DMM as short for Deluxe Memory Man, not digital multimeter 

[DavenPaget]

Sorry, I was using DMM as short for Deluxe Memory Man, not digital multimeter  

Hmm , 15VAC into simple 1N4001 bridge recto and into 7812 should be sufficient . i bet .
The extra overhead accounts for power line fluctuations , and bear in mind that a heatsink is needed beyond 100mA .
Well , 24VDC is to be safe anyway . They probably put 18VAC into that pack and rectified it , and most (bad) plugpacks i measured give 17v loaded ( it's 300mA but i only managed to load with 60+mA ) when they are rated for 9v(poor transformer regulation) ... well , i've got another unregulated wart that is only 3V away from 12v .
you could use 18VDC plugpacks if they are poorly regulated , but 24VDC is if they are regulated plugpacks , because i bet you EHX didn't want powerline fluctuations to send the regulator below dropout .
The same way i over-designed my power supply unit , 12-0-12VAC ( it's well regulated ) transformers , Over-provisioned heatsinking for the 7809 and the 7909 and massive caps for the mojo .  
( yes there is only 1 pair of them , but i can always build another one and connect from the rectifier since i used a 50VA tranny )

[guitylerham]

"Hmm , 15VAC into simple 1N4001 bridge recto and into 7812 should be sufficient "

Thank you, DavenPaget. How would I derive 15vac from either 11vac or 9vac currently supplied by my weber transformers to use for the 12vdc leslie simulator?

I know the weber transformer secondaries supply 300ma, if I am only powering one pedal with each secondary, do I still need to put a heat sink on the regulators? I don't think any secondary will get much more than 50ma draw from its respective effect circuit.

For the Deluxe Memory Man, I'm still confused whether or not I should deliver the 30vdc to the onboard 15v regulator or if I can get away with less. Of course, I'm not exactly sure how I'd get less since 9vac rectified would get 12.6vdc, and 11vac rectified would give about 15.4vdc. Both are less than I'd need. Maybe I can use a voltage doubler with a 9vac secondary to get something closer (maybe around 24vdc?) since I know that a voltage doubler with 11vac gives about 30vdc. That might be the ticket actually!

[DavenPaget]

"Hmm , 15VAC into simple 1N4001 bridge recto and into 7812 should be sufficient "

Thank you, DavenPaget. How would I derive 15vac from either 11vac or 9vac currently supplied by my weber transformers to use for the 12vdc leslie simulator?

I know the weber transformer secondaries supply 300ma, if I am only powering one pedal with each secondary, do I still need to put a heat sink on the regulators? I don't think any secondary will get much more than 50ma draw from its respective effect circuit.

For the Deluxe Memory Man, I'm still confused whether or not I should deliver the 30vdc to the onboard 15v regulator or if I can get away with less. Of course, I'm not exactly sure how I'd get less since 9vac rectified would get 12.6vdc, and 11vac rectified would give about 15.4vdc. Both are less than I'd need. Maybe I can use a voltage doubler with a 9vac secondary to get something closer (maybe around 24vdc?) since I know that a voltage doubler with 11vac gives about 30vdc. That might be the ticket actually!

Just tie 11v + 9v in phase then rectify it , after rectifying it pass it through a 7824 .
As for 15VAC ... i'm afraid , get a weak 15VAC transformer around the current you need . Too much will go over 20v .