Hi All,
I have been regitered here for a while now, but haven't made any contributions
I was wondering if you guys would be so kind as to have a look at my OPA549 Gainclone design.
My design is just "copies" of others I have seen, and jumbled around a bit to make it my own
I'm new to circuit design so all comments, tips and suggetions are welcome.
I will post the eagle file incase anyone wants a closer look.
But for now here is a screen shot:
I have been regitered here for a while now, but haven't made any contributions
I was wondering if you guys would be so kind as to have a look at my OPA549 Gainclone design.
My design is just "copies" of others I have seen, and jumbled around a bit to make it my own
I'm new to circuit design so all comments, tips and suggetions are welcome.
I will post the eagle file incase anyone wants a closer look.
But for now here is a screen shot:
Attachments
These chips need a low gain because of their low GBP, but remember that with a gain of 11 you need some more gain in another stage like an active preamplifier (or just an opamp circuit in the amp). I use a voltage gain of 3 in my DIY preamp, and 3 x 11 = 33 which would be sufficient.
Ok i have thickened up the output trace, will this now be thick enough to handle 8A?
I am also planning to make an active preamp using opa627 and buf634, but have not yet decided on chip configurations yet.
I will attempt this once i get some more experience under my belt
I am also planning to make an active preamp using opa627 and buf634, but have not yet decided on chip configurations yet.
I will attempt this once i get some more experience under my belt
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Alcaid said:Instead of using a jumper, you could connect SG-PG like this:
(The PCB will be a little bigger though)
LOL you beat me too it alcaid that was my next question, or could i join pins 3, 6 and 8 as they all connect to ground? or does this cause other problems?
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n00beR said:I have applied your suggestions Alcaid, nd have attached the new image below.
Would this implementation suffice?
Still missing the fat ouput trace. 100 mils ( 2.54mm) wide trace should do the job.
I've done it like the picture below:
I use other caps however, 100uF + 100nF, and separate PSU (High Cap Unregulated PSU like CarlosFM's design).
Also I have added a zobel to the output and an 0R1 wirewound output resistor (so I can parallell them).
Still waiting for the trafo so I can listen to them though....
I use other caps however, 100uF + 100nF, and separate PSU (High Cap Unregulated PSU like CarlosFM's design).
Also I have added a zobel to the output and an 0R1 wirewound output resistor (so I can parallell them).
Still waiting for the trafo so I can listen to them though....
Attachments
Alcaid said:also the gain is too high for the OPA549.
You have a voltage gain of (22/1+1=) 23.
Try something like 11. (1k and 10k resistors.)
Alcaid
on the datasheet(Open-loop gain and phase vs frequency)It looks like for a gain of 30 its flat up to 60k is that right?
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