| Electronics > Beginners |
| Use one single fader to atenuate 5 10mhz 0..5V analog differents signals |
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| Axxel:
Dear friends. I want to control the atenuation factor of 5 separate signals with a single potentiometer. Those signals will vary form 0 to 5Volts max, at a frequency of 10Mhz max. I thought I will use an operational amplifier in substraction mode, but it will not give me the correct result, because what I really need is a DIVISION. And a division is made with a voltage divisor, we don't need a op-amp. Exactly like an AUDIO VOLUME CONTROL, like double potentiometers, here is the same but not double, five-time! The idea is generate a voltage reference with this pot and use after 5 opeational amplifiers to divide each one of the input signals? |
| rstofer:
AD539 analog multiplier? https://www.analog.com/media/en/training-seminars/tutorials/MT-079.pdf Something similar? The ones I use are 4 quadrant and they accept +-10V inputs and give +-10V output. If the control input is 1V then the output for a +-10v input is just +-1V output. This is caused by the scaling factor K. Were it not for K, the output could be saturated fairly easily so they divide the real product by 10. |
| Axxel:
--- Quote from: rstofer on November 19, 2019, 07:21:03 pm ---AD539 analog multiplier? https://www.analog.com/media/en/training-seminars/tutorials/MT-079.pdf Something similar? The ones I use are 4 quadrant and they accept +-10V inputs and give +-10V output. If the control input is 1V then the output for a +-10v input is just +-1V output. This is caused by the scaling factor K. Were it not for K, the output could be saturated fairly easily so they divide the real product by 10. --- End quote --- Analog devices ICs are GOODS but expensive and too exclusive. I found quad op-amps circuits with the lm324 configuration and 10mhz bandwith like MC33079 https://www.onsemi.com/pub/Collateral/MC33078-D.PDF and the idea is using a classic op-amp... |
| vk6zgo:
5 motorised pots, run from a single controller. |
| not1xor1:
--- Quote from: Axxel on November 19, 2019, 05:53:31 pm ---Dear friends. I want to control the atenuation factor of 5 separate signals with a single potentiometer. Those signals will vary form 0 to 5Volts max, at a frequency of 10Mhz max. --- End quote --- I do not know if there are any parts able to get up to 10 MHz, but you might use digital potentiometers or OTAs You might even control the signals by PWM or use photoresistors... just some ideas |
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