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Old 17th June 2010, 10:51 AM   #11
maxw is offline maxw  United Kingdom
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Sounds good. I have schematic and layout for input selector. I'll post it when I get home.
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Old 17th June 2010, 09:38 PM   #12
maxw is offline maxw  United Kingdom
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Here is the Input selector I am making a PCB for. I'll use SMT ICs and also SMT omron g6k relays.
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Old 17th June 2010, 09:56 PM   #13
Geosto is offline Geosto  Netherlands
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What I think is missing in the list is the balance controller.
If you want to do well, then the left and right channels to be separately controlled by the controller.
Prevented then an extra circuit in the signal path.
You would have a chip that can have 16 relay switch.

Regards George
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Old 18th June 2010, 12:39 PM   #14
danzup is offline danzup  Romania
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Default My proposition

This is my idea of Input selection
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Old 18th June 2010, 01:24 PM   #15
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For balance control you only need to do it with software.
You could even do it with the volume control knob.
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Old 18th June 2010, 01:25 PM   #16
maxw is offline maxw  United Kingdom
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That would work, be more simple. You'd need some switches or jumpers to set the address and make sure to use relays that sink less current than that IC can allow.....which is 25mA I think???? Omron g6k were the lowest power relays I could find that were readily available but perhaps you know a better one? They are about 21mA I think.
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Old 18th June 2010, 01:32 PM   #17
maxw is offline maxw  United Kingdom
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Actually, can any of the pcf8574 ICs supply enough current to drive 6x relays @ 21mA simulataneously? I'm not sure how to interpret some of the ratings in the datasheet but noticed most other designs use a ULN23008 for this reason.
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Old 18th June 2010, 01:34 PM   #18
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yeah, why not use a driver or simply transitors its safer as trying to drive all relays with the Processor.
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Old 19th June 2010, 03:48 AM   #19
danzup is offline danzup  Romania
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Quote:
Originally Posted by maxw View Post
Actually, can any of the pcf8574 ICs supply enough current to drive 6x relays @ 21mA simulataneously? I'm not sure how to interpret some of the ratings in the datasheet but noticed most other designs use a ULN23008 for this reason.
It is like this : every pin can sink 25mA .
I am agree that jumpers for address are needed sometime.
I have tested with a lot of relay , direct drive : Takamishawa , Siemens and Omron at 5V are in between 15 mA ... 22mA Ireq wich is in the range .
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Old 13th August 2010, 08:53 AM   #20
maxw is offline maxw  United Kingdom
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Danzup, did you finish your project?
I have finished my version, works well! Here is some pics.
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File Type: jpg IMG_6206.JPG (21.5 KB, 203 views)
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