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JLH 10 Watt class A amplifier
JLH 10 Watt class A amplifier
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Old Yesterday, 05:36 PM   #7631
amplidude is offline amplidude  Denmark
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What you mean? Using Darlington?
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Old Yesterday, 05:56 PM   #7632
OldDIY is offline OldDIY
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Part of the main TTL (7400) circuit. Phase splitter stage and totem pole output stage (1965).
It was originally based on circuitry for vacuum tube.
Here is a US patent for a telephone line amplifier (a circuit with 4 transistors - a complete match).
Hood referred to Williams' amplifier.
https://www.electronics-tutorials.ws...-splitter.html

Last edited by OldDIY; Yesterday at 06:18 PM.
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Old Yesterday, 06:03 PM   #7633
cogitech is offline cogitech  Canada
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JLH 10 Watt class A amplifier
My 2SC5200s have arrived. 4 out of 5 have very healthy gain (150-170 range). The 5th one is way down at 58. Good thing I only need 4.

I'll be continuing to plan the cooling solution and will probably start building the circuits soon. I am cheating by using a PCB kit from ebay.
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Old Yesterday, 06:34 PM   #7634
OldDIY is offline OldDIY
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The Buffer Gate
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Old Yesterday, 06:44 PM   #7635
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Quote:
Originally Posted by miralin View Post
Hi all! I'm interested who and when invented a 3-transistor combination = JLH without first transistor. Smb help?
Totem Poles
A very popular output design is nick named the "Totem Pole" output stage. This is a "stack" of transistors of the same polarity, usually PNP germanium devices in the '50s and '60s, and later NPN and silicon devices came along in the '60s and '70s.
Solid State History - davidmorrinoldsite
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