Ultrasonic Dog Whistle

Published:2012/12/3 0:43:00 Author:muriel | Keyword: Ultrasonic Dog Whistle

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Speaker Mic Circuit

Published:2012/12/3 0:35:00 Author:muriel | Keyword: Speaker Mic Circuit

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The audio amplifier circuit

Published:2012/11/29 21:19:00 Author:Ecco | Keyword: audio amplifier

When the input signal level is less than 20mW , LM378 op amp directly uses 5Ω resistor to provide up to approximately 100mA peak current for load. When it is greater than 20mW, the load current bias flowing through 5Ω resistor to boost transistor and make it get conduction and increase the output power. Transistor and operational amplifier must be connected to a suitable heat sink.   (View)

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The phonographs amplifier circuit

Published:2012/11/29 21:30:00 Author:Ecco | Keyword: phonographs amplifier

LM387 is one model of LM38X series. LM38X series of products are advanced linear amplifier ICs with low noise, low distortion, wide bandwidth and suppressing fluctuations advantages. In addition, they use a single power supply, internal compensation, power supply decoupling and regulation, larger output voltage changes and larger power bandwidth. 600Ω resistor connected to the pickup head in parallel is used to prevent the current.   (View)

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Band pass Filter and RF Preamp

Published:2012/11/23 0:55:00 Author:muriel | Keyword: Band pass Filter, RF Preamp

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30 Watt VHF Amplifier

Published:2012/11/23 0:47:00 Author:muriel | Keyword: 30 Watt, VHF Amplifier

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MK484 Radio with Loudspeaker

Published:2012/11/23 0:45:00 Author:muriel | Keyword: MK484, Radio, Loudspeaker

A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker.   (View)

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Band 2 Preamplifier

Published:2012/11/23 0:39:00 Author:muriel | Keyword: Band 2, Preamplifier

This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88 - 108 Mhz.   (View)

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SW Aerial Amplifier

Published:2012/11/23 0:38:00 Author:muriel | Keyword: SW Aerial, Amplifier

A radio frequency amplifier to boost SW reception. Frequency range approximately 5 to 20 MHz.   (View)

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450-800MHz UHF Preamplifier

Published:2012/11/21 21:29:00 Author:muriel | Keyword: 450-800MHz , UHF Preamplifier

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Guitar Preamp with Tone Controls

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

Published:2012/11/21 21:09:00 Author:muriel | Keyword: 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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25 Watt Power Amplifier

Published:2012/11/21 1:49:00 Author:muriel | Keyword: 25 Watt , Power Amplifier

This is a 25 Watt power amplifier complete with separate preamp and tone controls. In addition the circuit has a loudness control (to boost bass at low audio power) and options for super bass and super treble enhancement. This is ideal for Ipod's, MP3 or CD players or can be used as a booster amplifier.   (View)

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Audio Preamp

Published:2012/11/21 1:48:00 Author:muriel | Keyword: Audio Preamp

A 2 stage audio pre-amplifier with very good performance.   (View)

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12 Volt 5 Watt Amplifier

Published:2012/11/21 1:47:00 Author:muriel | Keyword: 12 Volt , 5 Watt, Amplifier

This solid state amplifier uses 10 transistors and 5 diodes. It can deliver 5 Watts into a 4 ohm loudspeaker and about 3 Watts into an 8 ohm loudspeaker. It is made using Chineese transistors from the 1970's and 1980's.   (View)

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200mW Amplifier

Published:2012/11/21 1:44:00 Author:muriel | Keyword: 200mW , Amplifier

A small battery driven amplifier with 200mW output. This is a suitable amplifier for portable radios and other battery powered equipment.   (View)

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32 Watt Amplifier

Published:2012/11/21 1:43:00 Author:muriel | Keyword: 32 Watt, Amplifier

A 32 Watt per channel stereo power amplifier made using the TDA2050V monolithic integrated circuit.   (View)

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24 Watt Class A Amplifier

Published:2012/11/21 1:42:00 Author:muriel | Keyword: 24 Watt , Class A , Amplifier

A 24 Watt Class A Amplifier made from discrete semiconductors, built and tested by Marc Klynhans from South Africa.   (View)

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The GEM: Class-A//AB Amplifier

Published:2012/11/21 1:40:00 Author:muriel | Keyword: Class-A//AB, Amplifier

The GEM is an audio power amplifier embodying simultaneously active Class A and Class AB output stages for 100+ Watts into a 4 ohm loudspeaker. The front end pcb will drive up to 100+W variants, or the 200+ Watts version into a 4 ohm loudspeaker load.   (View)

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Buffer Amplifier

Published:2012/11/21 1:39:00 Author:muriel | Keyword: Buffer Amplifier

A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs.   (View)

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