Simple DiodeBridge Compressor

[abbey road d enfer]

great! thank you
i will use it to keep the unbalenced input level constant as the balanced one... so don t need that much out
i ll try
cheers

You don't need an unbalanced output when you already have a ground-sensing impedance balanced output.

 

[richiyobs]

sorry for misunderstanding
I thought you were referring to this Simple DiodeBridge Compressor.... i was looking for a combo input...
instead for the unbal/balout purpose i can leave the blendAmp as it was, cause one of out leg is ground sensing, in a different manner but it is, right?

 

[richiyobs]

here where i found the design
.....
It allows ground voltages to be canceled out even if the receiving equipment has an unbalanced input; it prevents any possibility of creating a phase error by mis-wiring, and it costs virtually nothing except for the provision of a three-pin output connector.

 

[richiyobs]

by the way thanks for all support , even when i m hard at understanding!
i d like to know if the combo input solution is properly done, so i ll finish the proto and can run measurments
best
richi

 

[abbey road d enfer]

here where i found the design
.....
It allows ground voltages to be canceled out even if the receiving equipment has an unbalanced input; it prevents any possibility of creating a phase error by mis-wiring, and it costs virtually nothing except for the provision of a three-pin output connector.

That's exactly why I suggested it.

 

[richiyobs]

Perfect! Thanks to confirm it
Best

 

[richiyobs]

Here again for troubling... Need psu help
Found a pwr Tfx... I d like to know if can be used for the attached purpose
Black wires for main 220, yellow earth and purple ones on secondary, read close to 24vac...
If not good for this purpose, then for what can be used?
Thanks for your attention

 

[richiyobs]

if i m not wrong 7818 regulator can handle max 35v..... adviced 33v max

 

[richiyobs]

https://groupdiy.com/attachments/simple-psu-gif.14934/found this.... can it be a solution?
or is always better to add voltage regulators?

 

[abbey road d enfer]

. Need psu help

This schemo is stupid. It's a voltage-doubler rectifier. With the 17Vac xfmr, the voltage before the regulators is about 43V, enough to fry the 78/78 regulators.
Anyway, with a single output xfmr, you can have only half-wave rectification, which is a source of hum.

 

[abbey road d enfer]

https://groupdiy.com/attachments/simple-psu-gif.14934/found this.... can it be a solution?

No. This could work for circuits that draw very little current, like 5mA. Even in that case the voltage would be +/-15, not +/-18.
You need full-wave rectification AND regulators.

 

[richiyobs]

Searching in my iron trash... Found a 15 0 15.... Is this voltage enough for 7818 and 7918?

 

[richiyobs]

No. This could work for circuits that draw very little current, like 5mA. Even in that case the voltage would be +/-15, not +/-18.
You need full-wave rectification AND regulators.

Perfect... Understand

 

[richiyobs]

At the moment I m running an old console psu for testing purposes... Never builded a psu...
I d like to have one to put into enclosure... I m looking at the mini psu of calrec eq...

 

[pvision]

A 15 0 15 transformer will give around 1.4 x 15 = 21 volts DC after full-wave rectification, so it should be fine for use with 15 volt regulators

Under no load, a 15 0 15 will typically show quite a lot more than 15 volts across each part of the secondary, but the voltage will fall with load

You can (and should) verify the secondary voltages before and after the diode bridge to verify they are within the limits for the regulator

 

[richiyobs]

A 15 0 15 transformer will give around 1.4 x 15 = 21 volts DC after full-wave rectification, so it should be fine for use with 15 volt regulators

Under no load, a 15 0 15 will typically show quite a lot more than 15 volts across each part of the secondary, but the voltage will fall with load

You can (and should) verify the secondary voltages before and after the diode bridge to verify they are within the limits for the regulator

Great! Thank you so much
Best

 

[richiyobs]

The mini psu.... I think it s by Gyraf
With 15 0 15.... I get 18 and - 19 with no load....
Cool!

 

[richiyobs]

tried to use one Sidechain to drive 2 channels
seems to work!
what do you think?

 

[richiyobs]

thinking economy and matching components time, i m trying this approach
maybe the feedback sum can be done in a proper manner, i m running a rude approach
best
richi

 

[abbey road d enfer]

tried to use one Sidechain to drive 2 channels
seems to work!
what do you think?

What signal are you going to use to feed the side-chain?