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Amplifiers: Audio Circuits
Amplifier -- Main Page          Audio Amplifiers Circuits -- Main Page

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Last Updated: November 20, 2015 03:33 PM

Circuits Designed by Dave Johnson, P.E. :
  • 3Khz Filter + Audio Amplifier  -  This circuit is the audio Amp section for a complete optical transmitter.  The circuit Amplifies and filters the voice audio signals from an electret microphone.  The circuit is described in more detail in . . . [Hobby Circuit designed by David Johnson P.E.,  06/04/00]

  • 3Khz Low Pass Filter Plus Audio Amp  -  This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio. The schematic includes an audio Amplifier that is designed to drive a standard audio head phone . . . [Circuit by David A. Johnson P.E.,  06/04/00]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

600W Audio Amplifier -  The circuit is based around {LM4702}manufactured by NATIONAL semiconductors&{MJ11029-MJ11028} by ON semiconductors It is a high fidelity audio power Amplifier. Designed for demanding consumer and pro-audio applications. You can also use this circuit with AV receivers, Audiophile power amps, Pro Audio High voltage industrial applications etc Amplifier output power maybe scaled by changing… [designed by YMYA electronics-IZHAR FAREED]

60W Guitar Amplifier -  This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar Amplifier are the very simple circuitry, even for comparatively high power outputs, and a certain built-in degree of loudspeaker protection, due to capacitor C8, preventing the voltage supply to be conveyed into loudspeakers in case of output transistors' failure… [Flavio Dellepiane's web site]

60W MOSFET Amplifier -  To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an Amplifier more powerful than the 25W MosFet, a 60, 90W High Quality power Amplifier design is presented here. Circuit topology… [Flavio Dellepiane's web site]

60W Power Amplifier -  This is a simple and low cost 60W power Amplifier. The optimal supply voltage is around 50V, but this Amp can work from 30 to 60V. The maximum input voltage is around 0.8, 1V. As you can see, in this design the components have a big tolerance, so you can build it with almost any components that you can find at home. The output power transistors can be any NPN types, but do not use Darlington types. … [Circuit design by Jacint Chapo]

6BM8 Amplifier -  A simple but good quality audio Amplifier using the 6BM8/ECL82 valve. Capable of a couple of watts. Information on using 100V PA line transformers as valve output transformers… [email designer: cablehack at yahoo dot com]

6W Amplifier using TA7222AP -  Here is the circuit diagram of a 6W Amplifier using the TA7222AP from Toshiba.TA7222AP is an excellent integrated audio Amplifier which can deliver 5.8W to a 4 Ohms load at 12V supply voltage. The IC has very good features like, muting function, low distortion, high ripple rejection, short circuit protection, thermal shut down etc. This Amplifier can be operated from 8 to 12V and this makes it ideal for car radio applications… [Designer's name not included]

6W mono car Amplifier using BA521 or BA532 Amplifier module -  Schematic only, no circuit description… [by Petr Prause]

7 Watt Class-A Audio Amplifier -  Behaves like a one-valve operated Amplifier.  Improved version of the 3-5W Class-A Amp… [Flavio Dellepiane's web site]

70 Watt Guitar Amplifier -  Easy to build - No setup requiredstacked tone controls; High performance: 70W into 4 Ohm - 45W into 8 Ohm loads… [Flavio Dellepiane's web site]

70W Class AB Hi-Fi Amplifier -  This project considers the development of a 70W Hi-Fi Power Amplifier for use as part of a Hi-Fi separates music system. The design is a fairly simple circuit topology, which is easy to understand and the author believes that the finished result sounds very nice indeed. The web posting is developed from an original design document available in pdf below. The detailed design issues are discussed in the pdf, while this posting discusses the more practical issues involved in producing the Amp. …

78 RPM & RIAA Phono Equaliser -  Multi Standard 78 RPM and RIAA Phono Equaliser handles all "standards"… [Rod Elliott (ESP)]

7V, 50mW OLED Driver from a 2V to 5.5V input -  The LTC3459 controls peak inductor current when VIN is greater than or less than VOUT. This allows current to be controlled during start-up in a boost application or VOUT to be regulated below VIN when powered from a fresh battery. Peak current control makes the LTC3459 an ideal candidate for charging a back-up source such… [Linear Technology App Note - , Mar 29th 2010]

7W Amplifier with TDA2003 audio circuit -  Here the schematic diagram of 7W audio Amplifier based on IC TDA2003.… [Designer's name not included]

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