Voltage divider board. |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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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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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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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
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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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
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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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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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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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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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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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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Kevin
North Staffordshire |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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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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