I am trying to learn about audio analgo volume control circuit design,but I cannot find useful stuff till now. Coudld any one help me? Thanks in advance!
things to bare in mind:
- It is usual to use a Logarithmic law pot control in audio
- You need to know impedance of subsequence stage fed from the pot
as too high a pot value can cause premature HF role off (treble loss)
- NEVER allow dc curent flow in pot (gets very noisy) only signal should flow.
- Best place to place control is a tradeoff between 'outputend' noise and frontend stage peak signal handling level in relation to input signal level.
- Use good quality pot for audio- ALPS pots are good for Hi-Fi
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hope this helps a bit. Checkout Langford Smith ( Radiotron's Designers Handbook old but excellent)
If you want voltage control check out the National Semiconductor data sheet for the LM13700 OTA chip. It has basic templates for voltage controlled amplifiers.
I must admit that I almost know nothing about audio analog volume control.
However, let me try to make it more specific.
Basically it is used for TV systems. For this application, I assume that the noise and THD should be very low; dynamic range should be very high; gain should be tunable.
Actually I want to know the usual specifications, architectures and design challenges etc.