(The Grado SR125i headphone is great, by the way.) Simple and Cheap. Feel free to send us your hi-fi audio schematics and we will add them here. Probably I would never be writing about this headphone amp schematic. Electra Preamp Electra variation combined with the Big Muff tone control. klick on the red links (project names) to view the schematics or article. This circuit is made in such a way that user can not only use it as Headphone Amplifier but also can drive a subwoofer speaker or normal speaker (4 ohms) and can get a amazingly loud sound through the speaker. Headphone Amp Simple headphone amp. LM383 Power Amp 8 watt power amp for driving a bigger speaker. If you have built any of these circuits, we would love to hear from you so send us your comments. This is our collection of DIY and Hi-Fi Audio Schematics. Below the new Kameleon portable amplifier. DIY Hi-Fi: Class a Hybrid Headphone Amp: FORWARD::::: This project was born out of a couple things. One was a need for an amp to drive some higher impedance headphones I had just bought. Craig Anderton’s practice amp. This Headphone Amplifier Circuit is made by using LM386 Audio Amplifier IC. DIY and Hi-Fi Audio Schematics. Headphone amplifier schematics designed by Solderdude: Below a (fully working) prototype of the desktop version (with the filter change top-lid open) + transformer. back to Schematics. The big wave of so-called hybrid headphone amps is scary: they look very high-end'ish, and I am the first one to advocate valves in sound reproduction, but mind you - using 15V at anode of ECC88 is insane. Related Schematics. Many of these diy Audio Books contain schematics. To switch it between these two modes we have used three jumpers here. LM386 Power Amp A half watt power amp to use with headphones or small speaker.