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The Brute: A 3-channel Audio Amplifier For Leslie Speaker Emulation

This post describes the design and construction of a 3-channel, 30 watts per channel, audio amplifier. Although my amp incorporates two antique HY60 power modules, construction details are given for construction using the modern TDA2050A, capable of yielding 32 watts. The amplifier is intended to be used as a Leslie Speaker Emulation driver unit, delivering [...]

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A Versatile Crystal Calibrator

Build The Hackit & Bodge Crystal Calibrator

Hackit & Bodge Crystal Calibrator – completed prototype

A while ago, I played around with changing the transmit and receive frequencies of a cheap FM Wireless Microphone rig. The only equipment I had was a trusty old Alnico scanner bought in the nineties. Although this was sufficient (or so [...]

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Re-create The Hackit & Bodge SGV1 Signal Generator

A JFET-based Franklin oscillator reprises 50’s valve design in this rough & ready 400KHz- 12MHz offering.

Hackit & Bodge Signal Generator – Recreated Prototype

Yep, I believe mine was built using a couple of EF80 TV pentodes – ‘cos they cost – nothing!
My memory of it is shaky, but quirky and temperamental are adjectives that spring [...]

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Retro Gear

From time-to-time I’ll add documentation/schematics etc., from my stash of manuals.

AKAI 4000D

To start you off, here’s a pic, together with a PDF document of the original User Manual and schematics.

AKAI 4000D – in original condition, and still going strong!

Click on the image below for the User Manual (includes schematic).

AKAI 4000D User Manual & [...]

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