Audio Circuit

Tube Regulator Circuit

Published:2011/7/17 21:07:00 Author:Felicity | Keyword: Tube Regulator Circuit

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OTL Negative Gate Voltage Doubler Rectifier Circuit (For Tube Amp)

Published:2011/7/17 21:29:00 Author:Felicity | Keyword: OTL Negative Gate Voltage, Doubler Rectifier Circuit, (For Tube Amp)

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Commonly Used High-voltage Doubler Circuit (For Tube Amp)

Published:2011/7/17 21:16:00 Author:Felicity | Keyword: Commonly Used, High-voltage Doubler, Circuit, (For Tube Amp)

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Tube High-voltage Rectifier Bridge Circuit

Published:2011/7/17 20:54:00 Author:Felicity | Keyword: Tube, High-voltage Rectifier, Bridge Circuit

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Stereo Power Amplifier Circuit

Published:2011/7/17 20:59:00 Author:Felicity | Keyword: Stereo, Power Amplifier, Circuit

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Crystal Diode Full-wave Rectifier Circuit (For Tube Amp)

Published:2011/7/17 21:19:00 Author:Felicity | Keyword: Crystal Diode, Full-wave Rectifier, Circuit, (For Tube Amp)

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Two-channel Amplifier Circuit

Published:2011/7/17 21:00:00 Author:Felicity | Keyword: Two-channel, Amplifier, Circuit

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Crystal Diode Bridge Rectifier Circuit (For Tube Amp)

Published:2011/7/17 21:26:00 Author:Felicity | Keyword: Crystal Diode, Bridge Rectifier, Circuit, (For Tube Amp)

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TWO_IC_AM_RADIO

Published:2009/7/16 3:59:00 Author:Jessie

National LM1820 IC serves for RF, oscillator, mixer, and IF stages of AM superheterodyne radio while LM386 IC is audio amplifier driving loudspeaker. Double-tuned circuit at output of mixer provides selectivity. Total gain from base of input stage to diode detector is 95 dB. CA is 140 pF, CB is 60 pF, L1 has 110 and 5 turns for broadcast band, L2 has 98 and 12 turns for oscillator, T1 has 140 turns center tap and 2 turns, T2 has 142 turns and 7 turns, and T3 has 142 turns center tap and 71 turns. IF value is 455 kHz. L3 has 3 turns on ferrite bead. - Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 3-4-3-8.   (View)

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160_METERS_TO_l0_METERS

Published:2009/7/16 3:55:00 Author:Jessie

Simple converter adds 160-meter band capability to older CW or AM receiver. Passive mixer is adequate. High output frequency eliminates IF feedthrough and image signals. Crystal oscillates on third over-tone and feeds directly into mixer. -A. Bloom, A Simple 160-Meter Converter, QST, Feb. 1975, p46.   (View)

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SINGLE_COIL_ORYSTAL_RADIO

Published:2009/7/12 23:45:00 Author:May

A starting setup for this circuit is as follows:Connect the antenna to the second tap up from the bottom of the coil (that's the end of the coil that's connected to ground). The diode should connect to about the fourth tap up from the bottom, and C1 should be attached to the seventh tap or so up from the bottom. Those tap positions might not be the best starting point for your antenna/ground arrangerttent. That doesn't matter, however, because to obtain the best results with the receiver at your location, you should experiment with all variables anyway.   (View)

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AUDIO_BOOST

Published:2009/7/16 6:29:00 Author:Jessie

LM380 power amplifier operating on 12 V is well suited for communication receiver having only limited audio gain. Circuit provides excellent headphone volume and enough loudspeaker output for small room. If signal at full secondary winding of product detector AF coupling transformer in receiver overloads U1, take signal from center tap of transformer winding that feeds volume control in amplifier.-H. L. Ley, Jr., More Audio for QST Course Receiver, QST, Oct. 1977, p 45.   (View)

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TWO_CHIP_AM_RADIO

Published:2009/7/16 6:20:00 Author:Jessie

Current drain of only 10mA makes operation from 6-V battery feasible. National LM1820N IC serves for oscillator/mixer, two IF stages, and AGC, and LM386N AF chip provides power output of 0.25 W into 8-ohm loudspeaker. D1 is diode detector.-E. S. Papanicolaou and H. H. Mortensen, Low Cost AM Radio Uses Only Two IC's, EDN Magazine, Jan. 20, 1976, p 82 and 84.   (View)

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12AU7 +5687 Push 845 Push-pull Amplifier Circuit

Published:2011/7/18 4:50:00 Author:Felicity | Keyword: 12AU7 +5687 Push, 845 Push-pull, Amplifier Circuit

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Bile Former Grade Circuit Of Good Performance

Published:2011/7/17 23:41:00 Author:Felicity | Keyword: Bile Former Grade, Good Performance

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6P3P Push-pull Tube Amp Circuit

Published:2011/7/17 23:43:00 Author:Felicity | Keyword: 6P3P, Push-pull, Tube Amp Circuit

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SIMPLE_AM_RADIO

Published:2009/7/17 2:33:00 Author:Jessie

An AM radio can be built of a simple diode detector and an audio amplifier. A random length of wire always serves as an antenna. L1 is an adjustable ferrite loopstick of the type used in transistor radios.   (View)

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MOTOR_CONTROLLING_MIXER

Published:2009/7/11 2:10:00 Author:May

Used to lock crystal oscillator frequency to standard-frequency signals from WWV. Circuit mixes dock and WWV frequencies (fed to tubes at left and right) in Nygaard discriminator ar rangement, which delivers two outputs, each equal to difference frequency but differing 90°in phase. These output signals are amplified for synchronous motor that drives trimmer capacitor of crystal oscillator in servo loop that brings difference frequency to zero.-K.Nygaard, Atomic Clock Accuracy for Crystal Oscillators, Electronics, 33:46, p82-83.   (View)

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4_bit_look_ahead_carry_adder_using_an_MC10179_and_four_MC10180s

Published:2009/7/17 3:26:00 Author:Jessie

4-bit look-ahead carry adder using an MC10179 and four MC10180s (courtesy Motorola Semiconductor Products Inc.).   (View)

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RECEIVER_FRONT_END_RF_ATTENUATOR

Published:2009/7/17 3:24:00 Author:Jessie

This PIN-diode front-end RF attenuator circuit contains a simple shunt circuit. The dc voltage from the potentiometer sets the attenuation level. The PIN diodes can be MV3404 or similar types.   (View)

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