Relay Volume Control for BLS

promitheus · 14th March 2004, 12:22 PM

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 don´t 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.

promitheus · 14th March 2004, 12:39 PM

This the Relay board.
I tonly has the Relays, volume resistors and the driver parts.
This is the whole board.

promitheus · 14th March 2004, 12:41 PM

This is a better pic, close up and sharper.

promitheus · 14th March 2004, 12:42 PM

Some pics of the unfinished boards

promitheus · 14th March 2004, 12:43 PM

These are the unfinished Control and PSU boards.

sianturi · 14th March 2004, 04:13 PM

How 'bout the schematics?

promitheus · 14th March 2004, 05:05 PM

For the microprocesor control and info you can get from TIll´s 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 Pass´s.
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.

promitheus · 14th March 2004, 05:08 PM

this is the thread with info.
Constant impedance relay-resistor logarithmic attenuator

till · 15th March 2004, 11:01 AM

Very pretty PCBs, i wish i had that pretty PCBs for my projects... Please report your findings with the corntroll, and keep in mind i´m still involved developing the firmware. Maybe you experience and ideas will help for further improvements on the code.

promitheus · 15th March 2004, 11:07 AM

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.

14th March 2004, 12:22 PM	#1
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	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 don´t 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.

14th March 2004, 04:13 PM	#6
sianturi diyAudio Member Join Date: Apr 2002 Location: France	How 'bout the schematics? __________________ The Great Saiyaman Siapa bertelinga hendaklah ia mendengar... (Mat 13:9)

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14th March 2004, 05:05 PM	#7
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	For the microprocesor control and info you can get from TIll´s 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 Pass´s. 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.

14th March 2004, 05:08 PM	#8
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	this is the thread with info. Constant impedance relay-resistor logarithmic attenuator

15th March 2004, 11:01 AM	#9
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	Very pretty PCBs, i wish i had that pretty PCBs for my projects... Please report your findings with the corntroll, and keep in mind i´m still involved developing the firmware. Maybe you experience and ideas will help for further improvements on the code.

15th March 2004, 11:07 AM	#10
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	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.