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Old 20th July 2003, 02:53 AM   #21
Rarkov is offline Rarkov  England
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JasonL:
Here's a tip you may not know - on surface mounted items, use a small drop of superglue to position and hold the device before soldering...It makes it far easier!

Gaz
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Old 20th July 2003, 02:54 AM   #22
jleaman is offline jleaman  Belgium
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That is a great idea. thanks now i know that.. : O )
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Old 20th July 2003, 05:52 AM   #23
jwb is offline jwb  United States
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To position surface mounts with two pads (resistors, capacitors, diodes, and so forth), I normally put a bit of solder on one pad, position the components, and solder it in place. Then I solder the other pad. Never fails.
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Old 21st July 2003, 07:56 PM   #24
jwb is offline jwb  United States
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Here's a much better photo:
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Old 7th August 2003, 02:28 AM   #25
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Hi JWB,
That's a pretty nice project you're doing. I'm curious if you have tested out the boards to see how it sounds during the volume adjustment. Are there any noticable clicks from the relays opening and closing?


Don
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Old 7th August 2003, 03:22 AM   #26
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congrats jwb...you do have inspiration for others
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Old 7th August 2003, 02:40 PM   #27
jwb is offline jwb  United States
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Quote:
Originally posted by Damedged2002
Hi JWB,
That's a pretty nice project you're doing. I'm curious if you have tested out the boards to see how it sounds during the volume adjustment. Are there any noticable clicks from the relays opening and closing?


Don
These Omron microminiature relays are quite loud. There is a clearly audible zip as you go up or down. If you need quiet relays, you would use Coto. They are almost inaudible, but also about twice as large.
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Old 7th August 2003, 03:16 PM   #28
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JWB,
I plan on building a stepped attenuator in the future. Instead of relays, I plan on using analog audio switches (Analog Devices SSM2404 Quad Audio Switch, if I can find them). According to the datasheets, these switch without the pops, etc. Have you experimented with these?

If you're interested in checking them out, here's the link to the datasheet.

http://www.analog.com/productSelection/pdf/ssm2404.pdf

Don
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Old 22nd January 2006, 12:10 PM   #29
Jos v E is offline Jos v E  Netherlands
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Smile Compact relay attenuator with remote control

Hi,
already a little while ago I also made my own relay attenuator.
It utilizes only 5 tiny relais for a 32-step stereo attenuator.
Besides manual (front knob) control, it simulatenously works with an IR remote control. Next to volume control it can also perform input channel selection (4 extra relays for 4 input channels).
All implemented with a (PIC) microcontroller as only IC.
The design allows connecting multiple boards under a single control, to implement balanced (XLR) designs or multi-channel audio.
You can see my design at: http://jos.vaneijndhoven.net/switchr/design.html

Broader background info and two utilities for dimensioning and analyzing switched attenuators are on:
http://jos.vaneijndhoven.net/switchr/index.html

Happy reading,
and let me know on your feedback!

greetings,
Jos
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Old 22nd January 2006, 06:09 PM   #30
jwb is offline jwb  United States
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Jos, that looks very nice! How sounds it?

My regret with my first attenuator is that I used 1/4W resistors. I should have used 2W resistors, or Dale, or some other kind of low noise, like you did.

I really appreciate that you share your source code. Thanks a lot.
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