With that high a voltage you could run a CapMx PSU (maybe the SLB - it will loose 3v per rail) and then power an F5 turbo. If you can get suitable / matched output transistors then that might be a good use of your transformers.
This amp is limited by the max voltage that the front end OpAmp will see (likely not continuous rating, but the switch on transient). For an OPA604 you're looking at +/-23v max
This amp is limited by the max voltage that the front end OpAmp will see (likely not continuous rating, but the switch on transient). For an OPA604 you're looking at +/-23v max
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Hi Dan,
I'm reposting my question elsewhere, at EUVL's request, so maybe we could discuss there?
Best
Nigel
I'm reposting my question elsewhere, at EUVL's request, so maybe we could discuss there?
Best
Nigel
Did anyone build /implement the little bootstrap boards? Wondering about giving this a go with the OPA2828
Can a Tea-Bag model be a class A/B? I got an used amp M2 but it doesn't run that hot I feel or it's just the really chilly weather.
hi shinken
yes the Tea-bag model is a "normal" M2. is you set the voltage up to e.g. 30V rail and set the bias to max 1A or less - then you get an A/B.
read the document from Patrick. there is very good written how does it work.
kr
chris
yes the Tea-bag model is a "normal" M2. is you set the voltage up to e.g. 30V rail and set the bias to max 1A or less - then you get an A/B.
read the document from Patrick. there is very good written how does it work.
kr
chris
I try but don't understand why power supply is on emitters?
And not according document.
And not according document.
Good work Harry, Can you please share a pic of the other side of the little board?
I'm still assuming that design intent is to use a 47K -ve global feedback resistor combined with a 470K local resistor. 3K3 series resistors on the 2x inputs and a 47K shunt on the +ve input
I'm still assuming that design intent is to use a 47K -ve global feedback resistor combined with a 470K local resistor. 3K3 series resistors on the 2x inputs and a 47K shunt on the +ve input
Did you trim/ finish the edges of those boards yourself? Looks very nice.
..Appears that we are moving away from the combined local & global feedback architecture, very interested in the results of this
..Appears that we are moving away from the combined local & global feedback architecture, very interested in the results of this
Hi Harry
You are wrong. the supply is there as written in the post 411 at the collector of Q1 and so on.
V- and V + are testpoints!
See my Post 363 with the LTSpice Test.
Kr Chris
Hmmm...is See...
Mechanical does not fit? ...Pic Please
In the small PCB ist written Pin 1 to 4
So are they two different PCB 's?
Kr Chris
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Of course it fits. 😊
There are (only) 2 extra connections required other than the 8 pins.
Go back to the Spice file and satisfy yourself first.
Patrick
There are (only) 2 extra connections required other than the 8 pins.
Go back to the Spice file and satisfy yourself first.
Patrick
Is the ground connection on the daughter board to input ground, or the output stage?
Looks like the design is single RCA input only with a19K global (non-mixed) feedback
Perhaps there is room to use the mixed feedback approach and an XLR input?
Looks like the design is single RCA input only with a19K global (non-mixed) feedback
Perhaps there is room to use the mixed feedback approach and an XLR input?
lets sum up what Patrick wrote:
post 362
The LT1010 represents a unity gain buffer, which of course can be the M2OPS.
so in the Lt spice file we have to think about that the LT1010 should be your M2OPS.
LTSpice do not care about the maximum ratings in real LT1010 --> about +/-22V rail
Note that Vin must always stay well between V+ and V-.
yes op amps are limited here
Only think about actual application when you have it working on breadboard.
In the test case, you need to remove the LT1010, as it will not survive 25V rails.
maximum rating of the LT1010 is +/-22V rail
post 366
You should check against the Spice circuit using your Gerber reader.
okay...my Gerber reader is not working at JLCPCB now...super slow...no results after 10minutes..
should be checked
Then suggest you use 1mm thick PCB.
It can go directly on top of a DIP8 pin header, which you should solder first of all.
The SOIC single opamp should go on last.
should be checked by DIYHarry
And it should fit directly onto the opamp location on the Power Whammy PCB.
okay...so my suggestion is DIP8 socket#1 is in the Whammy pcb
and DIP8 socket #2 is the place where the bootstrap pcb should be implemented
so put socket #2 into socket#1
You need to route the OPS output and Gnd to this adapter board.
---> see post 362 above
so in the Lt spice file we have to think about that the LT1010 should be your M2OPS.
ps:
i do not have M2OPS or this bootstrap pcb
kr
chris
post 362
The LT1010 represents a unity gain buffer, which of course can be the M2OPS.
so in the Lt spice file we have to think about that the LT1010 should be your M2OPS.
LTSpice do not care about the maximum ratings in real LT1010 --> about +/-22V rail
Note that Vin must always stay well between V+ and V-.
yes op amps are limited here
Only think about actual application when you have it working on breadboard.
In the test case, you need to remove the LT1010, as it will not survive 25V rails.
maximum rating of the LT1010 is +/-22V rail
post 366
You should check against the Spice circuit using your Gerber reader.
okay...my Gerber reader is not working at JLCPCB now...super slow...no results after 10minutes..
should be checked
Then suggest you use 1mm thick PCB.
It can go directly on top of a DIP8 pin header, which you should solder first of all.
The SOIC single opamp should go on last.
should be checked by DIYHarry
And it should fit directly onto the opamp location on the Power Whammy PCB.
okay...so my suggestion is DIP8 socket#1 is in the Whammy pcb
and DIP8 socket #2 is the place where the bootstrap pcb should be implemented
so put socket #2 into socket#1
You need to route the OPS output and Gnd to this adapter board.
---> see post 362 above
so in the Lt spice file we have to think about that the LT1010 should be your M2OPS.
ps:
i do not have M2OPS or this bootstrap pcb
kr
chris