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Old 8th May 2005, 04:13 AM   #1
ctardi is offline ctardi  Canada
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Default Opa549

I'm just learning about making amplifyers. Here is what I have come up with using information from the datasheets, and bigmike216. The input power will be about 18V. The of each channel will first go thru the DRV134, and also a preamp that has not been decided yet. What all changes will need to be made?
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Old 8th May 2005, 06:58 AM   #2
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first off, the voltage will be + and - 18v, before rectification..

When I have the pcb's made, it'll be easy as pie to assemble it, won't have to worry about how to wire anything

do a forum earch about bridging, also search for opa549 and drv134, there's a ton of information.

Talk to me on messenger or something and I'll help you out
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Old 8th May 2005, 04:09 PM   #3
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if you must use a decoupling capacitor, use it before the DRV because any difference in capacitance will result in different low frequency response on the 2 sides of the bridge. then you will get asymetric output at those frequencies affected
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Old 8th May 2005, 04:21 PM   #4
paulb is offline paulb  Canada
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Quote:
Originally posted by neutron7
if you must use a decoupling capacitor, use it before the DRV because any difference in capacitance will result in different low frequency response on the 2 sides of the bridge. then you will get asymetric output at those frequencies affected
Why would the capacitance be any different? If you're referring to the tolerance of the capacitors, it will be a very minor effect on frequency response.
But there should be a capacitor, and resistor to ground, before the DRV134.
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Old 8th May 2005, 04:48 PM   #5
ctardi is offline ctardi  Canada
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Quote:
Originally posted by bigmike216

Talk to me on messenger or something and I'll help you out

I was talking, but it was a one sided conversation. (you left signed into messenger)

A cap and resistor has been added before the 134...thanks. Other than that, does anyone see anything else majorly wrong with it?
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Old 8th May 2005, 06:32 PM   #6
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the capacitor and resistor need to be on the input.

What are you planning on doing for a power supply?
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Old 8th May 2005, 07:43 PM   #7
ctardi is offline ctardi  Canada
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Quote:
Originally posted by bigmike216
the capacitor and resistor need to be on the input.

What are you planning on doing for a power supply?
i know... they are on the input in version 1.2

Not sure about the power supply right now, still looking for a transformer.
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