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Pop/click free HW-based relay attenuator V3
Pop/click free HW-based relay attenuator V3
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Old 20th November 2020, 04:38 PM   #111
gionag is offline gionag  Italy
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Pop/click free HW-based relay attenuator V3
Quote:
Originally Posted by 454Casull View Post
Crazy question - does anybody have an expander PCB they are willing to sell?
I have a full assembled expansion and main board to sell
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Old 21st November 2020, 08:21 PM   #112
Gluca is offline Gluca  Italy
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Hi Neutrality

I put together the attenuator but I am having pops at -16 and -32. I am using just 6 relays, I got rid of the 1/2 LSB trick to simplify things (smallest step is non jumping so far) and using a 112.5Hz clock (8.8ms) to drive the flip-flops. Relays are panasonic TQ2 (3ms activating time according to specs). What should I look closer to fix it? I am not using you boards, I just made a few from scratches.

Thanks!
g
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Old 22nd November 2020, 12:47 PM   #113
Neutrality is offline Neutrality  Denmark
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Since you are not using my boards, but have built your own, I need to see the exact schematic of your design.
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Old 22nd November 2020, 03:15 PM   #114
Gluca is offline Gluca  Italy
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I inverted the relays!

When OFF they have no attenuation, when ON they attenuate. It should be the other way round ... basically when I am switching all relays OFF it pops as there is no attenuation at all. I also had to reverse the connections at the POT to increase vol clockwise. I will redo the board.
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Old 22nd November 2020, 08:53 PM   #115
Neutrality is offline Neutrality  Denmark
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Glad you found the error.

Inverting the relays will indeed cause pops.
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