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Index 7

Single Chip FM Radio Circuit

Published:2012-12-12 0:31:00 Author:muriel | Keyword: Single Chip, FM , Radio Circuit

Single Chip FM Radio Circuit
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Transistor Organ

Published:2012-12-12 0:27:00 Author:muriel | Keyword: Transistor Organ

Transistor Organ
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3 Watt FM Transmitters

Published:2012-12-12 0:26:00 Author:muriel | Keyword: 3 Watt, FM Transmitters

3 Watt FM Transmitters
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Portable CD Player Adapter For Car

Published:2012-12-12 0:19:00 Author:muriel | Keyword: Portable , CD Player Adapter, Car

Portable CD Player Adapter For Car
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Car Alarm Arming Horn Beep Canceller

Published:2012-12-10 0:45:00 Author:muriel | Keyword: Car Alarm Arming, Horn Beep Canceller

Car Alarm Arming Horn Beep Canceller
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Wireless Auto Tachometer

Published:2012-12-10 0:44:00 Author:muriel | Keyword: Wireless, Auto Tachometer

Wireless Auto Tachometer
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The motor overheating language newspaper called circuit

Published:2012-11-21 20:48:00 Author:Ecco | Keyword: motor overheating, language newspaper called

The motor overheating language newspaper called circuit
It is composed of temperature sensor, electronic switch circuit and language utterance circuit. When motor fails to run in the hot season or at room temperature, the motor will often appear overheating. The circuit can issue the sound of beep , please note to remind duty personnel.   (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 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

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

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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Audio Voice-Over Circuits

Published:2012-11-19 21:43:00 Author:muriel | Keyword: Audio Voice-Over Circuits

Audio Voice-Over Circuits
This is a circuit where a microphone and preamp circuit (voice circuit) have priority over any other audio signal. You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal.   (View)

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A simple audio power meter circuit using LM3915

Published:2012-10-28 21:11:00 Author:Ecco | Keyword: audio power meter

A simple audio power meter circuit using LM3915
Note: If the speaker internal resistance is 4Ω, Rx takes 10kΩ If the speaker internal resistance is 8Ω, Rx takes 18kΩ If the speaker internal resistance is 16Ω, Rx takes 30kΩIt uses IC to display AC input signal amplitude, and the more perfect method is to use a half - wave converter to change AC signal into DC signal, the DC signal is sent to the input terminal of IC.   (View)

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Simple Two-Transistor Radio

Published:2012-10-22 22:07:00 Author:muriel | Keyword: Simple, Two-Transistor, Radio

Simple Two-Transistor Radio
Here is a simple radio that was designed to minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high as the one-transistor reflex but the simplicity is attractive. Strong stations will provide plenty of volume into a crystal earphone or an external amplifier. The AM Loopstick was purchased on eBay but the enterprising experimenter can swipe one from the interior of a cheap radio. If the loopstick has more than one winding, use the one with the most turns. Wind 3 or 4 turns near one end of the winding as seen in the photo. The tuning capacitor in the prototype is from an old radio and the little plastic dial was cut down such that it just fit into the back of a black pointer knob. The fit was tight so no glue was needed. All of the sections of the capacitor were connected in parallel to get the most capacitance for this loopstick. All the other parts are common. The transistors can be just about any small-signal type. The prototype uses the metal can 2N2222, primarily for looks. Some transistors may have too much high frequency gain; if the circuit squeals, try adding a small resistor in the emitter of the first transistor, maybe 47 ohms, the smaller the better as long as the circuit is stable. The large 47 uF could be smaller in most cases but the circuit can pick up hum if the wires are too long. Don't leave out the large capacitor across the battery, it provides needed low power supply impedance.   (View)

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