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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Preamp Control - Volume, input, mute, remote
Preamp Control - Volume, input, mute, remote
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Old 16th October 2019, 09:49 PM   #161
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
The relays come in many voltages but it is the drive circuitry that need lower voltage.
The ICs need 5 volts so would still need 5 volt reg on board unless there are CMOS versions of all the chips, but no reason why the on-board AC transformer can't be removed and an external AC or DC power supply connected to the transformer output pads. The 5 volt reg would have to drop the extra volts so a 12 vdc would be better.
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Old 17th October 2019, 11:42 AM   #162
knutn is offline knutn  Norway
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Join Date: Mar 2006
Location: Oslo
Thank you for your answer.

I was thinking of a switching regulator for 24 V to 5 V. It is of course possible it can provide some new problems...
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Old 17th October 2019, 04:42 PM   #163
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
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Design wise anything is possible but you have to look at the cost vs benefit. The transformer is one of the most expensive single items on the board but if you redesign for higher voltage then will the parts replacing it be cost effective. I can't see a wall wart and another switching regulator being a similar cost trade off.
Also, if you have some parts running at 24v and some at 5v then you have to make sure they can interface together to do their jobs. It would be better to design for everything to run at the same voltage. Although I have used 5v and 3.3v on the same board in another design where the some of the oscillators needed 3.3v but fed there output to 5v counter/dividers, and that was a proper level change.
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