Nelson Pass said:I suggest you solve your problems with the complementary parts before looking for additional trouble.
I will post some trouble soon
Why do I have this mental image?
Why do I have this mental image of a wise man sheparding his children through the forest?
Thank you greatly for the guidance and calming our fears. You have to have the patience of a saint to put up with us. Oh yeah.. some parts showed up today. Soon all the bosses will head off to conferences and I can head down to the lab (otherwise known as our RF repair shop).
Why do I have this mental image of a wise man sheparding his children through the forest?
Thank you greatly for the guidance and calming our fears. You have to have the patience of a saint to put up with us. Oh yeah.. some parts showed up today. Soon all the bosses will head off to conferences and I can head down to the lab (otherwise known as our RF repair shop).
I had a strange dream last night... 
It was about drawing a schematic and I wondered what it was.
When I woke up, fortunately I could remember it. 😀
Mum, what is this ?
Boy, stay away from it. Looks evil.
Disclaimer:
There might be fatal errors in the circuit, specially the feedback values in the center section are not correct, no warranty whatsoever.
It was about drawing a schematic and I wondered what it was.
When I woke up, fortunately I could remember it. 😀
Mum, what is this ?
Boy, stay away from it. Looks evil.
Disclaimer: There might be fatal errors in the circuit, specially the feedback values in the center section are not correct, no warranty whatsoever.
LennyK said:
Why not try, and build it! 😉
On my sim, it doesn't work, but I couldn't manage to make any
configuration with LM741 work, so, it could be me or my sim
/Hugo
Why noone tryes to build the amp from post #53?
1) It is the simplest
2) Nelson said it should work
3) It qualifies best as a Monolithic SuperSymmetry amp with Current Feedback
4) You can get the parts for free (samples)
5) What else do you need?
P.S. Bernhard, your schematic is really a madness
1) It is the simplest
2) Nelson said it should work
3) It qualifies best as a Monolithic SuperSymmetry amp with Current Feedback
4) You can get the parts for free (samples)
5) What else do you need?
P.S. Bernhard, your schematic is really a madness
Rookie said:
P.S. Bernhard, your schematic is really a madness
Do you understand the intention of my madness ? 😕
Hugo
Waiting for the chips ...mmm, coming from Singapore..., I have again thought about R0, R15 (and R16). Since the non-inverting input node is not a virtual ground, we would see certain value of input voltage there due to the input signal. Meanwhile, the inverting input node should follow the non-inverting input node voltage, and so the current flows through R0. If this current is greater than the acceptable inverting input current of 15mA (LM6181), the R15 (and R16) should take part of it so that the current greater than 15mA can not flow into the inverting input. In this respect, a proper size of R0 and in addition a proper ratio between R0 and R15 (and R16) is considered essential. I more and more respect the values popped from Nelson Pass¡¯ hat. 🙂
I expect my new results and posting by this weekend.
JH
Waiting for the chips ...mmm, coming from Singapore..., I have again thought about R0, R15 (and R16). Since the non-inverting input node is not a virtual ground, we would see certain value of input voltage there due to the input signal. Meanwhile, the inverting input node should follow the non-inverting input node voltage, and so the current flows through R0. If this current is greater than the acceptable inverting input current of 15mA (LM6181), the R15 (and R16) should take part of it so that the current greater than 15mA can not flow into the inverting input. In this respect, a proper size of R0 and in addition a proper ratio between R0 and R15 (and R16) is considered essential. I more and more respect the values popped from Nelson Pass¡¯ hat. 🙂
I expect my new results and posting by this weekend.
JH
Bernhard said:
To me it looks senseless. But, if it works you should probably
get a Nobel prize. 😀
Maybe you should take a little break. It looks like this X-amps are
possesing you.
Rookie said:
To me it looks senseless. But, if it works you should probably
get a Nobel prize. 😀
Maybe you should take a little break. It looks like this X-amps are
possesing you.
Nobel prize... That sounds good 😉
If you look very closely to this part in the center, what does it do ? 😎
No idea if that makes sense, but it does something...
To JH:
You will be very happy when your parts come in a will start building with 6181 and 15030/31.
At least I am...
Wooooohhh, the sound of current feedback.
I recognized it immediately. Got a big amp in the living room, also current feedback. The transparency is just amazing!!
So, I rebuild the blown amp, put new LM's in it, and went for 100mV
across emitter R's, calibrated the "Magic Resistor" to 200ohm,
and slowly raised the current of the PSU's.
Again, the amp goes loud!!
It’s playing for about an our now, without a problem.
Don't know the exact sensitivity of my speakers, (Old B&W802 series 1 (maybe one of you knows how sensitive they are?) but its surely enough power for these speakers.
The LM’s get slightly warm.
Power consumption is now 250mA at idle.
I'll post some more measurements later.
To Bernhard:
Did you build your monster!!!???
Where are all you other DIY-ers out there? Someone have more results?
Why don't you give that "full opamp" amp a try, Rookie?
/Hugo - wonders if LennyK's drawing is 'buildable'..😉
You will be very happy when your parts come in a will start building with 6181 and 15030/31.
At least I am...
Wooooohhh, the sound of current feedback.
I recognized it immediately. Got a big amp in the living room, also current feedback. The transparency is just amazing!!
So, I rebuild the blown amp, put new LM's in it, and went for 100mV
across emitter R's, calibrated the "Magic Resistor" to 200ohm,
and slowly raised the current of the PSU's.
Again, the amp goes loud!!
It’s playing for about an our now, without a problem.
Don't know the exact sensitivity of my speakers, (Old B&W802 series 1 (maybe one of you knows how sensitive they are?) but its surely enough power for these speakers.
The LM’s get slightly warm.
Power consumption is now 250mA at idle.
I'll post some more measurements later.
To Bernhard:
Did you build your monster!!!???
Where are all you other DIY-ers out there? Someone have more results?
Why don't you give that "full opamp" amp a try, Rookie?
/Hugo - wonders if LennyK's drawing is 'buildable'..😉
Rookie said:
Hi Rookie
I fully intend to have a play with your circuit, all the bits have finally arrived, now all I need is some time!🙂
I thought you might have built one by now though?
Rookie,
I'm seriously thinking on building your version mainly because I would like to compare or even to cause a little bit of turmoil among the gaincloners since yours seems to be a fully integrated alternative, not an hybrid...
The version that I'm planning will be a little deviant from yours though... I'm planning on using the infamous LM3875 with a little bit of gain and a front stage with less gain so I'll end up with an overall gain about 15 or 20....
Also, I'm considering on implementing and all transistorized version of this X thread ( Post 1 ), since I have been always wanting to build some sort of CF amplifier since I spotted the Kaneda one, it was really 'noble' and easy to cope with, the sound was really good too...
-MKT-
I'm seriously thinking on building your version mainly because I would like to compare or even to cause a little bit of turmoil among the gaincloners since yours seems to be a fully integrated alternative, not an hybrid...
The version that I'm planning will be a little deviant from yours though... I'm planning on using the infamous LM3875 with a little bit of gain and a front stage with less gain so I'll end up with an overall gain about 15 or 20....
Also, I'm considering on implementing and all transistorized version of this X thread ( Post 1 ), since I have been always wanting to build some sort of CF amplifier since I spotted the Kaneda one, it was really 'noble' and easy to cope with, the sound was really good too...
-MKT-
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