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Voltage divider board.

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gen0me View Drop Down
Young Croc
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    Posted: 02 August 2019 at 2:57pm
Looking for voltage divider board. With speakons as the inputs or anything.. Than voltage divider around 150V to 1V. Possibly few attenuation values as from 128V to 1V I would lose 7bits.. Zero inductance resistors. Output with 1/4" jack/xlr. Do you know anything ready or do I have to build it myself?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote madboffin Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2019 at 4:06pm
Does it need to handle power (i.e. incorporate a dummy load)? There are various "power soak" things available that substitute the speaker in a valve amplifier for power resistors and provide a DI output. Maybe a quick look at their circuits will give you some ideas.

You will probably have to make it yourself but do you really need noninductive resistors at audio frequencies?

Years ago I made one (long gone) for obtaining line level audio from 100V line speaker circuits etc - from what I remember it was a few resistors plus a selector switch for input level and a 1:1 transformer, built into an Eddystone box. Terminals in and XLR out.




Edited by madboffin - 02 August 2019 at 4:08pm
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gen0me View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2019 at 5:23pm
Originally posted by madboffin madboffin wrote:

Does it need to handle power (i.e. incorporate a dummy load)?
No. Out will be connected to line input of soundcard. Its only for audio measurements. During development of speakers. Possibly power supplied to speakers monitoring or less possibly some feedback algorithms control.
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gen0me View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2019 at 5:58pm
Beneficial could be also low resistance resistor to connect in series with the speaker.  So I can connect it to soundcard input and this way find out current on the speaker.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2019 at 3:25pm
If you've got the time and know what you want I'd say you're best off building your own.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2019 at 6:20pm
If you use the input to the amplifier instead, that will be a scaled version of what the amp's putting out to the speaker already, so long as you're not limiting or clipping the amp.
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gen0me View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2019 at 6:02am
Originally posted by kedwardsleisure kedwardsleisure wrote:

If you use the input to the amplifier instead, that will be a scaled version of what the amp's putting out to the speaker already, so long as you're not limiting or clipping the amp.
But cant figure out the voltage drop when runned close to amp limits.
One of the ideas is to measure amplitude on driver by comparing to voltage. If the feedback will be controlling limiters there is no chance to do something stupid from power compression, drunkenness etc.
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