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Solid state and mechanical signal switchers, degradation?, [moved from General Audio]
shaocaholica
post Oct 2 2013, 16:19
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How much signal degredation can I expect from solid state and mechanical analog signal switchers?

I currently have a Psyclone PSC01 laying around which is solid state and I'm thinking of using it to just switch audio on the L/R RCA connectors.

http://www.atomroot.com/ebay/psyclone_manual.pdf

I guess high end receivers use solid state switches too right? I'm just not sure how much difference there is across different switch parts and if its a complex part(to get right) or not.
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saratoga
post Oct 2 2013, 16:35
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Mechanical relays eventually wear out after a large number of switching events.

Baring lightening or some similar event, a solid state switch essentially lasts forever.
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pdq
post Oct 2 2013, 21:01
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The OP was actually asking about signal degradation, not electrical component degradation.
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Speedskater
post Oct 2 2013, 22:00
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The above unit can switch component video, so it should have no problems on the analog audio inputs.


--------------------
Kevin
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Arnold B. Kruege...
post Oct 2 2013, 22:51
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QUOTE (shaocaholica @ Oct 2 2013, 11:19) *
How much signal degredation can I expect from solid state and mechanical analog signal switchers?

I currently have a Psyclone PSC01 laying around which is solid state and I'm thinking of using it to just switch audio on the L/R RCA connectors.

http://www.atomroot.com/ebay/psyclone_manual.pdf

I guess high end receivers use solid state switches too right? I'm just not sure how much difference there is across different switch parts and if its a complex part(to get right) or not.


All solid state switches are not the same, and all relays are not the same. The specs on this device are non-existent. The good news is that if you use its capabilities to switch digital audio, it will either work or not, but changing the sound quality of the audio is highly unlikely.

This would be what a proper set of specs for an analog switch would look like:

http://www.ebay.com/itm/New-LCD-Digital-St...e-/320778483014
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shaocaholica
post Oct 3 2013, 06:00
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Well I took the cover off and identified some of the ICs its using for switching.

I found 2 sets of Pericom ICs. One was designed for analog video switching so I figured that IC wasn't used for audio which leaves only the other:

http://www.pericom.com/assets/Datasheets/PI5A100.pdf

I'm not the best at comprehending these datasheets...
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Arnold B. Kruege...
post Oct 4 2013, 14:16
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QUOTE (shaocaholica @ Oct 3 2013, 01:00) *
Well I took the cover off and identified some of the ICs its using for switching.

I found 2 sets of Pericom ICs. One was designed for analog video switching so I figured that IC wasn't used for audio which leaves only the other:

http://www.pericom.com/assets/Datasheets/PI5A100.pdf

I'm not the best at comprehending these datasheets...


On the one hand, this chip is like 10 times better in terms of critical performance parameters than some of the classic analog switch chips (4066, 4051) that I worked with back in the day.

On the other hand going from a data sheet to the performance of a finished product is a big leap.
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shaocaholica
post Oct 4 2013, 15:05
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Thanks for looking! May I ask whats so good about these ICs spec-wise?
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Arnold B. Kruege...
post Oct 4 2013, 17:26
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QUOTE (shaocaholica @ Oct 4 2013, 10:05) *
Thanks for looking! May I ask whats so good about these ICs spec-wise?



Low, linear On resistance.
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stephan_g
post Oct 10 2013, 20:04
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On the downside, the IC is only good for up to +6 V of supply, so it'll barely manage switching a typical CD player 0 dBFS signal (2 Vrms or ~5.6 Vpp) with a following wind. Chances are it would be powered by +5 V in real-life equipment. A CD4066 can take up to 15 V at least (which still is kinda impractical), and a modern-day audio switch like the LC78211 will withstand up to +/-20 V and thus interface to common audio supply voltages easily.
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