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Pop/click free HW-based relay attenuator
Pop/click free HW-based relay attenuator
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Old 18th April 2014, 08:29 AM   #11
Neutrality is offline Neutrality  Denmark
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Quote:
Originally Posted by syklab View Post
Hi,
How many pub I need for 2 channel?
You need 1 PCB for 2 Channels.
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Old 18th April 2014, 08:33 AM   #12
Neutrality is offline Neutrality  Denmark
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Quote:
Originally Posted by syklab View Post
Those SMd part doesn't look that bad.
Some of the parts are really small, however with some skill and patience it can be done.

I did mine without using a microscope and then I used a small loupe to check for solder bridges.

Patience is the key.
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Old 18th April 2014, 08:38 AM   #13
poldus is offline poldus  Europe
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I would like to buy one board. What is the supply voltage?

Last edited by poldus; 18th April 2014 at 08:40 AM.
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Old 18th April 2014, 08:59 AM   #14
Neutrality is offline Neutrality  Denmark
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Quote:
Originally Posted by poldus View Post
I would like to buy one board. What is the supply voltage?
12 Volt DC.
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Old 18th April 2014, 09:53 AM   #15
syklab is offline syklab  United States
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Hi Neutrality,
One dumb question, how do you dial the volume on this attenuator module?
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Old 18th April 2014, 10:24 AM   #16
Neutrality is offline Neutrality  Denmark
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Quote:
Originally Posted by syklab View Post
Hi Neutrality,
One dumb question, how do you dial the volume on this attenuator module?
You just connect a 10-50k linear potentiometer to the molex header marked "pot" and then you just use it as a normal volume control.

The potentiometer puts out a voltage between 0(max attenuation) and 5V(Min attenuation. That voltage is read by an ADC that converts it to a binary value which is then used to control the relais.

So you not only get the smooth feeling of turning a normal potentiometer, like in a normal volume control, but you also get the very accurate channel matching from max to min attenuation, low noise, low distortion that you typically get from a relay attenuator.
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Old 18th April 2014, 12:59 PM   #17
Neutrality is offline Neutrality  Denmark
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For those who want a PCB, see my first post.
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Old 18th April 2014, 05:44 PM   #18
Neutrality is offline Neutrality  Denmark
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This is a picture showing where that extra 1uF cap mentioned in post 1 should be placed.
Attached Images
File Type: png Extra 1uF cap.png (679.0 KB, 937 views)
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Old 20th April 2014, 10:00 AM   #19
Neutrality is offline Neutrality  Denmark
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Here is an updated RAB V1 - BOM - Mouser with the extra 1uF cap added.

Top component placement and orientation.

Bottom component placement and orientation.
Attached Files
File Type: zip RAB V1 - BOM - Mouser.zip (686.3 KB, 94 views)
File Type: pdf RAB V1 - Top Components.pdf (13.8 KB, 96 views)
File Type: pdf RAB V1 - Bottom Components.pdf (16.1 KB, 88 views)

Last edited by Neutrality; 20th April 2014 at 10:02 AM.
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Old 20th April 2014, 08:34 PM   #20
cliffforrest is offline cliffforrest  United Kingdom
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Pop/click free HW-based relay attenuator
How do you ensure it is monotonic?
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