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Philbrick opamp bases | diyAudio
https://www.diyaudio.com/community/threads/philbrick-opamp-bases.107464/
They could be used in audio but don't ask for too much gain or they won't even pass the 20KHz audio frequency requirements. Still, these are fun for experimenting and you can find more info's about their use in audio applications in the 1992 Vol.4/Nr.3 issue of GLASS AUDIO. ("Vacuum Tube Op Amps Applied" by Eric Barbour, p.12) •••
Some Designs and Applications for ... - The Philbrick Archive
http://philbrickarchive.org/some%20designs%20and%20applications%20for%20packaged%20amplifiers%20using%20subminiature%20tubes.pdf
Two circuits for direct-coupled amplifiers have been designed and tested and are shown in Fig. 2. The circuit of Fig. 2a has considerable gain due to the pentode, and a low output impedance as a result of the cathocle follower. The input amplifier depends upon similarity of the variation of con-tact potential of the input grids for stabilization
Reflex Radio Receivers - The Philbrick Archive
http://www.philbrickarchive.org/jlrmsousa/reflex_radio_receivers_1924_ocr.pdf
AUDIO TRANSFORMER Fig. 5. Schloemilch and Von Bronk U. S. Patent, Feb. 17, 1914. No. 1,087,892. » AUDIO TRANSF-Fig. 6. Regenerator reflex proposed by Armstrong and Bucher, 1915-1918. current but no appreciable amount of audio frequency or fluctuating direct current. An inductance coil will pass most audio frequencies but chokes off radio fre-7
OPERATIONAL AMPLIFIERS: Basic Circuits and Applications
https://people.engr.tamu.edu/s-sanchez/ECEN%20457%20Lect%201.pdf
the vacuum tube K2-W invented in 1952 by George Philbrick. - Texas Instruments invented the integrated circuit in 1958 which paved the way for Bob Widlar at Fairchild inventing the uA702 solid state monolithic op amp in 1963. - But it wasn’t …
An audio circuit collection, Part 3 - Texas Instruments
https://www.ti.com/lit/an/slyt134/slyt134.pdf
An audio circuit collection, Part 3 Introduction This is the third in a series of articles on single-supply audio circuits. The reader is encouraged to review Parts 1 and 2, which appeared in the November 2000 and February 2001 issues, respectively, of Analog Applications Journal. Part 1 concentrated on low-pass and high-pass filters.
Active-filtering circuit for audio DACs
https://www.ti.com/lit/pdf/sbaa322
Active-filtering circuit for audio DACs PaulFrost Design Goals Filter Characteristics Filter Input Cutoff Frequency Filter Gain 4VPP, 1.42VRMS –3dB @ 23kHz –1 V/V, 0 dB Design Description This circuit shows the implementation of a second-order active-filter for audio digital-to-analog converter (DAC) applications. In applications such as ...
Audio Circuits
https://www.circuitstoday.com/category/audio-circuits
Audio oscillator circuit. ICL 8038 waveform generator. ICL8038 is a monolithic waveform generator IC that can produce sine, square and triangular waveforms with very little distortion. The frequency can be programmed…. Read More. In Audio Circuits.
A list of Simple audio circuits and amplifiers for DIY(Do ...
https://www.circuitstoday.com/simple-audio-circuits
6. 3 Channel audio splitter circuit – This is a simple 3 channel audio splitter circuit designed with op amp NE5532 from Fairchild semiconductors.NE5532 is a dual internally compensated low noise opamp with high small signal and power bandwidth, making it well suited for high quality audio applications. 7. 2×60 Watts audio amplifier – This ...
What’s All This Absurd Filter Stuff ... - Electronic Design
https://www.electronicdesign.com/technologies/analog/article/21790957/whats-all-this-absurd-filter-stuff-anyhow
I told him sure, I could find a cookbook circuit in any number of audio handbooks, such as the recent reprint of the old 1976 NSC Audio-Radio handbook, available at www.AudioXpress.com for about $16.
Analog Circuit Design : Free Download, Borrow, and ...
https://archive.org/details/AnalogCircuitDesign
Analog Circuit Design. Addeddate 2015-09-04 15:55:18 Identifier AnalogCircuitDesign Identifier-ark
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