I am trying to search for an analog solution where the resistance is changed by voltage or current. A bit like a pot that changes by applied power.
Thank you a lot, It looks interesting. I'll read the datasheet.
Other suggestions are still very welcome. 🙂
Other suggestions are still very welcome. 🙂
There are probably some Dallas Semiconductor non-volatile digital potentiometers whose value is determine by the voltage applied to a control node. I suppose that these can be inserted as the feedback resistor.
Unfortunately, you'll have to source them through eBay.
Unfortunately, you'll have to source them through eBay.
For best sound quality, you want these. These have been used in recording studio automated mixing boards since they were made and sold under the dbx name decades ago.
https://thatcorp.com/selection-blackmer-voltage-controlled-amplifiers/
For less expense there's the LM13700.
https://thatcorp.com/selection-blackmer-voltage-controlled-amplifiers/
For less expense there's the LM13700.
I have had excellent result with the CS3310 or one of its variants:
https://docs.rs-online.com/d699/0900766b804c9851.pdf
There's also a higher voltage version and even an 8 channel version.
What's good enough for Jeff Rowland is good enough for me.
Digital pots are often less suitable because you would want a log law and most digipots are linear.
They also have relatively high distortion.
Jan
https://docs.rs-online.com/d699/0900766b804c9851.pdf
There's also a higher voltage version and even an 8 channel version.
What's good enough for Jeff Rowland is good enough for me.
Digital pots are often less suitable because you would want a log law and most digipots are linear.
They also have relatively high distortion.
Jan
1) Junction FET
https://en.wikipedia.org/wiki/JFET
2) Analogue multiplier
https://en.wikipedia.org/wiki/Analog_multiplier
https://www.analog.com/media/en/technical-documentation/data-sheets/ad633.pdf
3) Balanced Modulator
http://www.mit.edu/~6.301/LM1496.pdf
4) PWM volume control
http://mehtadhaval.blogspot.com/2011/01/digital-volume-control-using-cd4066.html
There are other methods that're more complicated than the above.
If you are just having a play... have a look at the old M5222 I/C which are still knocking around from the usual suspects.
Not the last word in design by todays standards but it is as easy to use as an opamp and good fun to play with.
Not the last word in design by todays standards but it is as easy to use as an opamp and good fun to play with.
Thank you all so much, you are all great! 🙂
From not having a single idea do I now have so many options. Please keep them coming, I'd read about each and every suggestion, and there are several great ways I can see now that may work for me.
From not having a single idea do I now have so many options. Please keep them coming, I'd read about each and every suggestion, and there are several great ways I can see now that may work for me.
PGA2310 - if you can afford it, top performer. But its digital control rather than voltage.... Could add microcontroller and ADC and make it voltage controlled I suppose!