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Index 265

4 Band Double Tuned Preselector

Published:2012/11/21 21:14:00 Author:muriel | Keyword: 4 Band , Double, Tuned Preselector

4 Band Double Tuned Preselector
The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate coils.The preamplifier is double tuned on the input having two IFT coils for each RF range, input applied to G1 of a double gate MOSFET. Gain control is applied to G2 and the output is taken from the DGMOSFET drain terminal. Click here for a picture of a MW loop. Click hereto view a finished picture of this project. (View)

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Q- Multiplying Loop Antenna

Published:2012/11/21 21:13:00 Author:muriel | Keyword: Q- Multiplying, Loop Antenna

Q- Multiplying Loop Antenna
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Medium Wave Active Antenna

Published:2012/11/21 21:13:00 Author:muriel | Keyword: Medium Wave , Active Antenna

Medium Wave Active Antenna
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AM Receiver

Published:2012/11/21 21:12:00 Author:muriel | Keyword: AM Receiver

AM Receiver
This is a compact three transistor, TRF receiver with fixed feedback. It is similar in principle to the ZN414 which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good. (View)

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Guitar Preamp with Tone Controls

Published:2012/11/21 21:10:00 Author:muriel | Keyword: Guitar Preamp, Tone Controls

Guitar Preamp with Tone Controls
An electric guitar pre-amp with tone controls using dual supplies. The guitar pickup is high impedance, therefore good quality screened cable must be used between guitar pickup and the preamp. (View)

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Sound of Light Circuit

Published:2012/11/21 21:09:00 Author:muriel | Keyword: Sound , Light Circuit

Sound of Light Circuit
An experimental circuit that converts light to sound. The circuit uses a solar cell as the input transducer, blocks the DC produced by the cell, but amplifies the light received by the cell. Sunlight, moonlight, torchlight all produce sound which is amplified by this circuit. (View)

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Guitar Preamp

Published:2012/11/21 21:09:00 Author:muriel | Keyword: Guitar Preamp

Guitar Preamp
A pre-amplifier for electric guitars. The guitar pickup is high impedance, therefore good quality screened cable must be used between guitar pickup and the preamp. (View)

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Guitar Reverb Effect Version 2

Published:2012/11/21 21:07:00 Author:muriel | Keyword: Guitar, Reverb, Effect Version

Guitar Reverb Effect Version 2
This is my second-generation guitar reverb circuit. The fidelity is much improved over the earlier design, it is suitable for use as a front-end to a guitar amplifier. This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for the optimal gain settings. (View)

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Guitar Fuzz Effect

Published:2012/11/21 21:01:00 Author:muriel | Keyword: Guitar Fuzz Effect

Guitar Fuzz Effect
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Simple Color Organ

Published:2012/11/21 21:00:00 Author:muriel | Keyword: Simple Color Organ

Simple Color Organ
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Mini Metronome

Published:2012/11/21 21:00:00 Author:muriel | Keyword: Mini Metronome

Mini Metronome
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Electronic Siren

Published:2012/11/21 20:59:00 Author:muriel | Keyword: Electronic Siren

An electronic siren made from discrete components. A push button switch is used to create the sound, which rises in pitch when the switch is pressed, and falls in pitch when the switch is released. (View)

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Sound Effects Generator 2

Published:2012/11/21 20:59:00 Author:muriel | Keyword: Sound , Effects Generator 2

Sound Effects Generator 2
This circuit uses the Holtek HT2884 IC to produce 8 different sound effects. (View)

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Sound Effects Generator

Published:2012/11/21 20:58:00 Author:muriel | Keyword: Sound, Effects Generator

Sound Effects Generator
This circuit uses a UM3561 IC to produce four different sound effects. (View)

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Metronome Circuit

Published:2012/11/21 20:55:00 Author:muriel | Keyword: Metronome Circuit

A metronome circuit based on a simple astable. The output sound is distorted to emphasize the pulses. (View)

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Electronic Canary

Published:2012/11/21 2:16:00 Author:muriel | Keyword: Electronic Canary

Electronic Canary
An electronic version of a chirping canary. May be used as an alarm, a sound effects generator or perhaps a replacement doorbell. (View)

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PWM Motor Control

Published:2012/11/21 2:15:00 Author:muriel | Keyword: PWM , Motor Control

PWM Motor Control
This is a circuit to control motor speed uses pulse width modulation (PWM). The PWM signal is generated by the ubiquitous 555 timer and output current amplified by a power transistor. (View)

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Internet Streaming Recording Aid

Published:2012/11/21 2:14:00 Author:muriel | Keyword: Internet, Streaming, Recording Aid

Internet Streaming Recording Aid
This small and handy device acts as an interface between your computer sound card and is a complete system for listening to streaming audio from the many thousands of Internet Radio Stations. (View)