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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

interesting pot !!!
interesting pot !!!
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Old 22nd December 2017, 01:03 PM   #1
glennjarrett is offline glennjarrett  United Kingdom
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Default interesting pot !!!

Does anyone know anything about these boasting 1000 resistors needs 5vdc and has internal relays ? Click the image to open in full size.


① The overall seal design, the use of aviation-grade aluminum alloy materials using precision CNC manufacturing aluminum forming. Shell with frosted gold process technology. long lasting.

② Using potentiometer control MCU high and low level, pure resistance circuit, exponential curve, adjust the sense of smooth.

③ With the Netherlands VISHAY one thousand high-precision chip resistors, with high reliability, anti-vibration ability. Solder joint defect rate and low. High frequency characteristics of superior. Reduced electromagnetic and RF interference to sound quality is a good guarantee.

④ Omron audio gold contact signal relay, with long life, gold-plated contacts mainly to improve the contact contact resistance, loss of long life, to ensure good contact.

https://www.ebay.co.uk/itm/New-VISHAY-SMD-Resistor-Relay-R2R-Dual-Channel-Six-Foot-Potentiometer-5K-10K-50K/272867472431?ssPageName=STRK:MEBIDX:IT&_trksid=p20 55119.m1438.l2649
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Old 22nd December 2017, 03:15 PM   #2
AndrewT is offline AndrewT  Scotland
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This could be a stepping volume controller, using a signal relay to initiate a mute function.
Or it could be a relay selected stepping vol pot, but very unlikely in such a small case.
Or it could be codswallop since there is no specification against which to compare the product to what is (not) promised.
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Old 22nd December 2017, 03:22 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Sounds like an excellent way of emptying your wallet. Sales bullsh1t or what!
Looks like a standard cermet pot in the opening. If pure resistance as quoted, it would be passive, not active.
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Old 22nd December 2017, 06:59 PM   #4
turk 182 is offline turk 182  Canada
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Click the image to open in full size.
this does seem to suggest power is required, no?(6 to 9v but is that DC or AC?)would be interesting to see the insides.

Last edited by turk 182; 22nd December 2017 at 07:02 PM.
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Old 23rd December 2017, 08:39 AM   #5
merlin el mago is offline merlin el mago
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ebay link "Note: This potentiometer system requires a set of DC5V voltage"
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Old 23rd December 2017, 10:40 AM   #6
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by merlin el mago View Post
ebay link "Note: This potentiometer system requires a set of DC5V voltage"
and it states there is a relay.
That's why I thought here might be a mute
Quote:
This could be a stepping volume controller, using a signal relay to initiate a mute function.
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Old 23rd December 2017, 10:54 AM   #7
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by glennjarrett View Post
Does anyone know anything about these boasting 1000 resistors needs 5vdc and has internal relays ? Click the image to open in full size.


① The overall seal design, the use of aviation-grade aluminum alloy materials using precision CNC manufacturing aluminum forming. Shell with frosted gold process technology. long lasting.

② Using potentiometer control MCU high and low level, pure resistance circuit, exponential curve, adjust the sense of smooth.

③ With the Netherlands VISHAY one thousand high-precision chip resistors, with high reliability, anti-vibration ability. Solder joint defect rate and low. High frequency characteristics of superior. Reduced electromagnetic and RF interference to sound quality is a good guarantee.

④ Omron audio gold contact signal relay, with long life, gold-plated contacts mainly to improve the contact contact resistance, loss of long life, to ensure good contact.

https://www.ebay.co.uk/itm/New-VISHAY-SMD-Resistor-Relay-R2R-Dual-Channel-Six-Foot-Potentiometer-5K-10K-50K/272867472431?ssPageName=STRK:MEBIDX:IT&_trksid=p20 55119.m1438.l2649
Well, the title says it all. It's a potentiometer with six feet.

No, seriously, the description seems to imply somehow that it might be an R2R stepped attenuator. Maybe it's controlled via the small pot visible in the photos. But I wonder how that would fit into such small case. I guess there is only one way to find out...
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Old 23rd December 2017, 05:49 PM   #8
georgehifi is offline georgehifi  Australia
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Quote:
Originally Posted by JonSnell Electronic View Post
Sounds like an excellent way of emptying your wallet. Sales bullsh1t or what!
Looks like a standard cermet pot in the opening. If pure resistance as quoted, it would be passive, not active.
+1 looks like one of these.
http://www.taydaelectronics.com/medi...a/-/a-1851.jpg

Cheers George
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Old 2nd January 2018, 01:54 AM   #9
nattawa is offline nattawa  Canada
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The "thousand" perhaps was meant to be thousandth in resistor precision.

The pot in the front could be a DC divider that tells the MCU about its angular position, so as for the latter to determine a relay combination for the stepping resistor network.

It appears to be a challenge for the given space, but with a flexible PCB it's probably doable.
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