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Old 19th March 2004, 10:02 PM   #1
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Default Alps Stepped Attenuator

This is quite a hot topic lately. I'm looking for resonably priced, high-performance stepped attenuators for BrianGT's chip amp as well as my built Foreplay and a future Grounded Grid build.

I stumbled across the 4X23alps at Triode Electronics. Anyone have any opinions on this item?

It seems to have four poles, so is this series or ladder?
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Old 19th March 2004, 10:07 PM   #2
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If it includes little PC boards for mounting the resistors and ea. deck has only 7 pins for connecting those resistors (23 positions). Unless I'm missing somethingt, it may be a mono switch?
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Old 23rd March 2004, 03:10 AM   #3
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Quote:
If it includes little PC boards for mounting the resistors and ea. deck has only 7 pins for connecting those resistors
The other pins are on the bottom side of the board where you can't see them,
that's where the second PC board solders to the switch.

With the PC boards provided you can make a stereo ladder attenuator,
but of course you skip the boards and wire it however you like.
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Old 30th March 2004, 12:45 AM   #4
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Just received this the other day. Here are some pics.
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Old 30th March 2004, 12:58 AM   #5
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Here's a pic of one of the mounted boards.
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Old 30th March 2004, 01:21 AM   #6
BrianGT is offline BrianGT  United States
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Quite interesting. I wonder how it compares to the Elma unit that I just picked up.

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Old 30th March 2004, 01:44 AM   #7
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Certainly not as pretty. I've been studying this thing for about a half hour, being very unfamiliar with attenuators and voltage dividing networks. But it appears to be a 23 position ladder just as Ned says.

It will require a two wire link to connect the grounds between both boards. Here's the other board which should make more sense. From top to bottom, the large pads should be in, out, ground, in, out, ground.

The far left pin connects to the wiper.
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Old 30th March 2004, 01:52 AM   #8
BrianGT is offline BrianGT  United States
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How does the switch feel? I am really happy with the feel of the Elma unit, as it feels much smoother than the other switches that I have (grayhill, electroswitch and the one in my asian attenuator).

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Old 30th March 2004, 02:11 AM   #9
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I wouldn't call it smooth. There's a little roughness felt through little plastic knob, stolen from my foreplay, as the ball slaps in and out of the holes. The holes have pretty sharp edges.

Might feel better with some more lube, wear and/or a heavier knob. Assuming it doesn't exhibit the problem you guys found with those blue attenuators you guys found in Asia, I could be happy with it.
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Old 30th March 2004, 02:12 AM   #10
BDP is offline BDP  United States
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The Elma switch not only feels good, but it will last. It's been 5 years on this preamp and its as quiet as it was new, very recommended.
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