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Simple discrete unity gain buffer
Simple discrete unity gain buffer
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Old 16th October 2018, 06:40 AM   #131
bimo is offline bimo  Indonesia
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Diamond Buffer with output cascode.
R24 should 100R and R5 500R trimpot.
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Old 16th October 2018, 07:08 AM   #132
donovas is offline donovas  South Korea
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Calvin, i just really like the sound of the buffer 128. it's very musical which i suspect is because of bootstrap feedback. because of this i'd like to explore the circuit more. no doubt your circuit sounds supreme but positive feedback always holds a magical appeal to me.
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Old 17th October 2018, 06:02 AM   #133
Calvin is offline Calvin  Germany
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Hi,

hey, nothing to excuse for You
I just wondered, because You mentioned that the CFP-Buffer īd be beyond Your skills .... while it indeed is no more complicated than the other buffers.

jauuu
Calvin

ps. thanks btw. for assuming my buffer to be supreme
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Old 23rd October 2018, 12:26 PM   #134
maouna is offline maouna  Greece
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I did an ac analysis for the elector buffer in LTSpice and there is a huge peak in the transfer function.how can this be cured?
Attached Images
File Type: png cascode-bc550-buffer.png (5.9 KB, 326 views)
File Type: gif elektor-discrete-buffer.gif (11.0 KB, 330 views)
File Type: jpg Untitled.jpg (336.9 KB, 322 views)
Attached Files
File Type: asc Electorbuffer.asc (3.9 KB, 6 views)

Last edited by maouna; 23rd October 2018 at 12:30 PM.
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Old 23rd October 2018, 01:17 PM   #135
bimo is offline bimo  Indonesia
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I did an ac analysis for the elector buffer in LTSpice and there is a huge peak in the transfer function.how can this be cured?
Add bandwidth limiting at the cascode transistor.
Attached Files
File Type: asc Electorbuffer-bimo.asc (4.2 KB, 22 views)
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Old 23rd October 2018, 01:44 PM   #136
Bigun is offline Bigun  Canada
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Simple discrete unity gain buffer
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Originally Posted by donovas View Post
how strong is this buffer btw? im wanting to see if i can drive my sennheiser 600 with it. its 300ohm impedance.
Theoretically speaking, the distortion will climb as the buffer finds it has to drive a lower impedance, even 300 Ohm is more trouble than if using the buffer as a pre-amp driving the input stage of a power amp. But doesn't mean that it won't sound very good. So did you try this yet ?
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Old 2nd November 2018, 05:06 AM   #137
donovas is offline donovas  South Korea
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Quote:
Originally Posted by bimo View Post
Add bandwidth limiting at the cascode transistor.
bimo, would it be possible to see that in jpeg format? i can't open that file. thank you.
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Old 2nd November 2018, 07:21 AM   #138
bimo is offline bimo  Indonesia
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bimo, would it be possible to see that in jpeg format? i can't open that file. thank you.
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File Type: jpg Electrobuffer-bimo.jpg (527.7 KB, 233 views)
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Old 6th November 2018, 07:40 AM   #139
Calvin is offline Calvin  Germany
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Hi,

did You consider using LEDs (red) instead of R11, R12 and couple them thermally to the NPNs to achieve higher thermal stability of the ccs?
And in using one of the LEDs as kind of preregulator for the second LED the ccs achieved far higher dynamic output impedance.

jauu
Calvin
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Old 17th November 2018, 08:09 PM   #140
donovas is offline donovas  South Korea
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so once again, its this circuit

Click the image to open in full size.

how can i bias this higher? do i change the bottom resistor 1.5k ohm and the top resistor 15k to lower values?

and is the input resistor necessary if you're not putting a pot before it?
um, i'd like to ask again, how can i bias this circuit higher? just change all the resistors to lower value?
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