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Chip Amps Amplifiers based on integrated circuits

TDA7293 datasheet
TDA7293 datasheet
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Old 29th January 2013, 07:14 AM   #61
Mooly is offline Mooly  United Kingdom
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TDA7293 datasheet
I still don't see it tbh

Are you trying to switch the mains here or the DC side ? How does the cap charge in the right hand diagram
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Old 29th January 2013, 12:41 PM   #62
Kitax is offline Kitax  Latvia
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yeah well i need another swich for the cap to charge... it would take too much swiches actually... :S
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Old 29th January 2013, 12:43 PM   #63
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TDA7293 datasheet
Use the nicad battery idea... easy and simple.
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Old 29th January 2013, 07:06 PM   #64
Kitax is offline Kitax  Latvia
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ok...

you mean like this, right?
Click the image to open in full size.
p.s.
the polarity of battery isnt right...

Last edited by Kitax; 29th January 2013 at 07:15 PM.
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Old 29th January 2013, 07:51 PM   #65
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TDA7293 datasheet
Something like this. The 9 volt nicad starts the relay. When the amp rail takes over, that supply keeps the relay energised.

Choose R1 to give required trickle charge current.
Choose R2 to give 12 volts across the relay.
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File Type: png Relay.png (26.0 KB, 31 views)
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Old 30th January 2013, 09:18 AM   #66
Kitax is offline Kitax  Latvia
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oh ok... the diodes on the top if ment for the battery not to discharge, right? and the zener, for it to not overcharge right?
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Old 30th January 2013, 11:54 AM   #67
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TDA7293 datasheet
That's it. The zener clamps the battery voltage. Set the charge rate low, something like 30/C. Diodes would all be 1N4004 or similar
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Old 30th January 2013, 01:28 PM   #68
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the problem is that if i use a 12 volt battery... well its pretty expensive for the power switch
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Old 30th January 2013, 01:46 PM   #69
Kitax is offline Kitax  Latvia
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http://sharp-world.com/products/devi...pr36mf51_e.pdf

can i use this one?
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Old 30th January 2013, 07:06 PM   #70
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TDA7293 datasheet
There's a bit of confusion here

I thought we were keeping it simple and using a normal mechanical relay. A 12 volt relay coil with the relay switching 240 volts mains. Using an opto triac is a whole different thing. The triac would have to control a larger power triac to handle the switch on surge and current requirements.
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