W
Winfield Hill
- Jan 1, 1970
- 0
Jim started a cute thread on a.b.s.e. with a pdf post. Many
if not most of you can't read binary groups, and the messages
are not archived by Google so they soon disappear. I feel like
a bit of ASCII art, so I'll try translating the thread here.
---------------------------------------------------------------
Newsgroup: alt.binaries.schematics.electronic
Title: SillyAmp - SillyAmp.pdf
Author: Jim Thompson
Date: Thu, 15 Mar 2007 15:20:19 -0700
Message-ID: <[email protected]>
Just a silly playing around. [pdf image]
Has 9nV/rt-Hz input-referred noise... not as good as compound
NPN/PNP. But has 0.03% Distortion with no overall feedback loop.
.. ________________________ +17
.. | | ,---- 6.8k ----,
.. 2.2k 2.2k | __ |
.. | | | | \ gnd
.. | +----------+---|+ \
.. | | | >-----+----
.. +------------- | ---------+---|- / | OUT
.. IN | | | |__/ TL071 |
.. --------- | ------------ | ----, | |
.. | | | '---- 6.8k ----'
.. \_|_ TL431 (2) \_|_ |
.. ---+-----/ \ / \----+
.. | --- --- |
.. 3k | 470u | 3k
.. | +-- 12 ---|(---+ |
.. gnd | | gnd
.. 6.8k 6.8k
.. | |
.. ____|______________|____ -17
ed: http://focus.ti.com/docs/prod/folders/print/tl431a.html
Author: John Larkin
Date: Mon, 19 Mar 2007 15:46:04 -0700
Hey, I can do silly amps, too. [jpeg image]
.. +200
.. +12 |
.. | |
.. R |
.. | |/
.. _V_ --> | npn
.. | |\e
.. IN | | OUT
.. --------+ +---------
.. | |
.. | |/e
.. _V_ --> | pnp
.. | |\
.. R |
.. | |
.. -12 |
.. -200
Author: Jim Thompson
Ooooooh! That's gross ;-)
Author: John Larkin
How else are you gonna get 400 volts p-p swing with two active
parts?
Author: Tim Williams
Date: Tue, 20 Mar 2007 14:15:43 -0600
Easy, you do it with one.
Warning: input is at -400V [gif image]
.. +400
.. |
.. RL
.. |
.. +---- OUT
.. |
.. IN |-'
.. ----+---|| 1500V
.. | |-, MOSFET
.. 100k |
.. | Rs
.. __|______|_____
.. -400
Author: John Larkin
Fine, if your input doesn't mind floating on -400.
Author: Fred Bartoli
Date: Wed, 21 Mar 2007 23:45:45 +0100
That one is 800Vpp, and 400Vpp isn't necessary symmetrical.
And you're having a bit of crossover distortion with the optos.
Speaking of dreadful amplifier: [ascii "image"]
..
.. .-------+-----< +400
.. | |
.. .-. |
.. | | |
.. | | |
.. '-' |
.. | |
.. .-------+----||-+
.. | | ||->
.. | | ||-+
.. | | |
.. --- --- |
.. --- --- |
.. | | |
.. | | |
.. >-------+ +-------+----+---->
.. | | | |
.. | | | .-.
.. | | | | |
.. --- --- | | |
.. --- --- | '-'
.. | | | |
.. | | | |
.. | | ||-+ ===
.. | | ||<- GND
.. '-------+----||-+
.. | |
.. .-. |
.. | | |
.. | | |
.. '-' |
.. | |
.. '-------+----< -400
Author: John Larkin
That's the famous KTFG (kiss the fets goodbye) circuit.
Author: Jim Thompson
Yep, Just prior to the KYAG ritual ;-)
if not most of you can't read binary groups, and the messages
are not archived by Google so they soon disappear. I feel like
a bit of ASCII art, so I'll try translating the thread here.
---------------------------------------------------------------
Newsgroup: alt.binaries.schematics.electronic
Title: SillyAmp - SillyAmp.pdf
Author: Jim Thompson
Date: Thu, 15 Mar 2007 15:20:19 -0700
Message-ID: <[email protected]>
Just a silly playing around. [pdf image]
Has 9nV/rt-Hz input-referred noise... not as good as compound
NPN/PNP. But has 0.03% Distortion with no overall feedback loop.
.. ________________________ +17
.. | | ,---- 6.8k ----,
.. 2.2k 2.2k | __ |
.. | | | | \ gnd
.. | +----------+---|+ \
.. | | | >-----+----
.. +------------- | ---------+---|- / | OUT
.. IN | | | |__/ TL071 |
.. --------- | ------------ | ----, | |
.. | | | '---- 6.8k ----'
.. \_|_ TL431 (2) \_|_ |
.. ---+-----/ \ / \----+
.. | --- --- |
.. 3k | 470u | 3k
.. | +-- 12 ---|(---+ |
.. gnd | | gnd
.. 6.8k 6.8k
.. | |
.. ____|______________|____ -17
ed: http://focus.ti.com/docs/prod/folders/print/tl431a.html
Author: John Larkin
Date: Mon, 19 Mar 2007 15:46:04 -0700
Hey, I can do silly amps, too. [jpeg image]
.. +200
.. +12 |
.. | |
.. R |
.. | |/
.. _V_ --> | npn
.. | |\e
.. IN | | OUT
.. --------+ +---------
.. | |
.. | |/e
.. _V_ --> | pnp
.. | |\
.. R |
.. | |
.. -12 |
.. -200
Author: Jim Thompson
Ooooooh! That's gross ;-)
Author: John Larkin
How else are you gonna get 400 volts p-p swing with two active
parts?
Author: Tim Williams
Date: Tue, 20 Mar 2007 14:15:43 -0600
Easy, you do it with one.
Warning: input is at -400V [gif image]
.. +400
.. |
.. RL
.. |
.. +---- OUT
.. |
.. IN |-'
.. ----+---|| 1500V
.. | |-, MOSFET
.. 100k |
.. | Rs
.. __|______|_____
.. -400
Author: John Larkin
Fine, if your input doesn't mind floating on -400.
Author: Fred Bartoli
Date: Wed, 21 Mar 2007 23:45:45 +0100
That one is 800Vpp, and 400Vpp isn't necessary symmetrical.
And you're having a bit of crossover distortion with the optos.
Speaking of dreadful amplifier: [ascii "image"]
..
.. .-------+-----< +400
.. | |
.. .-. |
.. | | |
.. | | |
.. '-' |
.. | |
.. .-------+----||-+
.. | | ||->
.. | | ||-+
.. | | |
.. --- --- |
.. --- --- |
.. | | |
.. | | |
.. >-------+ +-------+----+---->
.. | | | |
.. | | | .-.
.. | | | | |
.. --- --- | | |
.. --- --- | '-'
.. | | | |
.. | | | |
.. | | ||-+ ===
.. | | ||<- GND
.. '-------+----||-+
.. | |
.. .-. |
.. | | |
.. | | |
.. '-' |
.. | |
.. '-------+----< -400
Author: John Larkin
That's the famous KTFG (kiss the fets goodbye) circuit.
Author: Jim Thompson
Yep, Just prior to the KYAG ritual ;-)