ARP 1601 clone Build Thread

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Ultra Wiggler
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Re: ARP 1601 clone Build Thread

Post by KSS » Thu Feb 13, 2020 6:46 pm

Kipling wrote:
Thu Feb 13, 2020 3:53 pm
I think you've mis-read or misinterpreted my post - "I have stuck to my intention and added six upright side-adjust single-turn trimmers type 3362M"
Yes, please accept my apologies. I should have noticed not only the words but also the screenprint.

Glad to see the 4 pad update! Thank You.

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Ultra Wiggler
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Re: ARP 1601 clone Build Thread

Post by Kipling » Fri Feb 14, 2020 1:32 pm

Slight amendment, without changing the PCB layout any further from my last post, the recommended *single-turn* gate voltage adjust trimmers is now six-off 652-3362X-1-103LF (single-turn, upright, side-adjust, 10K) which fits the silkscreen outline perfectly and has the staggered pins in the correct orientation and places.

You can if you wish use the common top adjust 652-3362P-1-103LF although the rotation will be reversed (anti-clockwise for full voltage) and will not match the silkscreen outline, or the 652-3362M-1-103LF (in-line pins, upright, side-adjust) which matches the silkscreen but slightly offset and has the correct orientation (clockwise for full voltage).

The multi-turn trimmers are still recommended to be four-off 652-3296Y-1-102LF (1K) and four-off 652-3296Y-1-104LF (100K), although others will fit such as in-line pin variant 652-3296W-1-102LF (1K) and 652-3296W-1-104LF (100K), although the silkscreen outline will be a little offset.

Note: all part numbers are Mouser codes. Drop the '652-' prefix to check stock elsewhere.

You can of course use other manufacturer's similar products. Pretty much anything will fit the pads as long as the ends of the trimmer track are on the two outer pins and the wiper is in the centre (in-line or offset by 0.1") but check the orientation for full voltage once installed. Note: trimmers with a 0.2" wiper offset, such as the Bourns 3362F series or many open-frame trimmers, will not fit.

Hope this all makes sense.

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Common Wiggler
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Re: ARP 1601 clone Build Thread

Post by FactoryDefault » Fri Feb 14, 2020 8:45 pm

elmegil wrote:
Tue Feb 11, 2020 11:31 pm
FactoryDefault wrote:
Tue Feb 11, 2020 11:07 pm
I twisted the 4 outer pins on my switches by 90 degrees. It worked great.
I'm having a hard time picturing what you mean. Photos?

Filing is working, but is time consuming.
Sorry the switches are already soldered and the lid is already on my 1601 but I’ll try to describe my process:

Grip each pin with needle nose with the tip pointing toward the switch. Have the tip of the pliers slightly overlap the shoulder of the pin. Now slowly twist the pliers 90 degrees. This will twist the thick part of the pin into a spiral but won’t break the thin part. The center point of the pin doesn’t shift and the pad inside won’t deform but now the thin part of the pin is sideways you’ll have enough clearance to fit the offset hole pattern.

Btw the switches on the new build feel way better than the ones on my old build. They were kinda notchy and got stuck easily but these are really smooth.

edit: I haven't put the sides on yet so here's a pic of the side of one of the switches:
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Last edited by FactoryDefault on Sat Feb 15, 2020 12:00 pm, edited 1 time in total.

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Re: ARP 1601 clone Build Thread

Post by elmegil » Fri Feb 14, 2020 9:05 pm

Got it. Thank you :)

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