Relay Volume Control for BLS - diyAudio
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Old 14th March 2004, 12:22 PM   #1
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Default Relay Volume Control for BLS

I just finished my PCB for a relay volume control.
This is only the relay board which only has the relays, resistors and driver circuits.

The Ralays here are the Takamisawa Relays at 12 Volts. The resistors are Welwyn low noise but very good priced.

There is one more board with the PIC Microprocesor and encoder on it which looks like a small poti. I will be posting that soon. I donīt have the encoder yet.

What is very practical is that you can stack the relay pcbs to get as many channels as you want.

One board is for a stereo signal or one balanced signal. If you want to balanced signal like I will be using for the Balanced Line Stage then you can use 2 PCBs one on top of the other.

You can even use more pcbs for a surround volume.

More information will come soon.
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Old 14th March 2004, 12:39 PM   #2
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This the Relay board.
I tonly has the Relays, volume resistors and the driver parts.
This is the whole board.
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Old 14th March 2004, 12:41 PM   #3
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This is a better pic, close up and sharper.
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Old 14th March 2004, 12:42 PM   #4
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Some pics of the unfinished boards
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Old 14th March 2004, 12:43 PM   #5
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These are the unfinished Control and PSU boards.
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Old 14th March 2004, 04:13 PM   #6
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How 'bout the schematics?
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Old 14th March 2004, 05:05 PM   #7
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For the microprocesor control and info you can get from TIllīs website here:
http://home.tu-clausthal.de/~tpa/relais/index.html
Till was kind enough to give 2 PICs so I could start this project.
I really want to thank him for his help.

The relay part is a bit different from Tills or from Nelson Passīs.
It is a constant load attenuator. That means the load is always 5KOhms no matter what the setting.

I will find links and info on the subject.
Actualy you can find everything in this forum.
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Old 14th March 2004, 05:08 PM   #8
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this is the thread with info.
Constant impedance relay-resistor logarithmic attenuator
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Old 15th March 2004, 11:01 AM   #9
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Very pretty PCBs, i wish i had that pretty PCBs for my projects... Please report your findings with the corntroll, and keep in mind iīm still involved developing the firmware. Maybe you experience and ideas will help for further improvements on the code.
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Old 15th March 2004, 11:07 AM   #10
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Hi Till,

thanks for your nice words.
Without your help with the firmware my project would work in the first place. When I order some more boards I will give you some at cost price if you want.

Do you have done anything new with the firmware?

What I wanted to do is give the Volume control a display of some kind.
One idea is using 8 leds decoding the binary 8 bit code to decade.
Or a 7 segment led display.
Or the best but expensive a lcd display.
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