New - Knight KB-85 Replacement Boards

I've just made a brand new set of driver boards for the KB-85 amp. These are direct replacements made with all new high-grade parts on 70um clad fibreglass boards. This is the first run.

These are drop-in replacements for the old phonelic boards which are often either missing or burnt up.

Also, I've made a capacitor board for the KB-85 that sits underneath the chassis.  You can keep the original can electrolytics for cosmetics and have brand-new, higher tolerance electrolytics on a fibreglass board.

Two 10-watt resistors on this board, raised on ceramic standoffs.  They sit just under the mesh for airflow. It is almost impossible to find replacements for the original tubular-type ceramic power resistors, so I've substituted regular rectangular resistors rated for 250 ohms at 10W.

Eico HF-35 Tube Amp Restoration Project

Eico dual mono block amplifiers are now fully restored and sounding as sweet as they did back in 1965. See the whole project here: http://xtremetronics.blogspot.com/p/eico-hf-35-project.html

Honey, I Cloned the Arduino

Here's the final prototype for the "McDuino", a microcontroller board based on the Atmel ATMega 186 chip.

See our Arduino project here:
http://xtremetronics.blogspot.com/p/atmel-microcontrollers.html

The design is based on the Arduino Single Sided Serial Board (Version 3).

See how we prototype printed circuit boards here:
http://xtremetronics.blogspot.com/p/make-your-own-printed-circuits-boards.html

Allied Knight KB-85 60-Watt Amplifier Modifications

Known as "the poor mans' Macintosh", the design is said to be excellent, although very little has been written about this amp.

I took it down to the bare metal. The plans are to heavily modify the unit, but without altering the design aspects that made this a classic sounding amp.

See our Knight restoration project here: http://xtremetronics.blogspot.com/p/allied-knight-kb-85-project.html

Programmable Logic Controller

Here is the prototype for my X-Y Axis PLC experiment.

The logic interfaces an Arduino microcontroller to a couple of H-bridge stepper motor controller chips, running two X and Y axis, geared steppers on the right. Push button controls run pre-programmed routines for the stepper tracking.

The board contains both 5V and 24V power supplies and an encoder wheel for fine manual adjustments of the motor movements.

Bench Testing Microcontroller Boards

Trying to trace an auto-reset pulse on this board.

McAllister Gain Clone Amp

This is my beta version of the Gain amp.

The boards turned out nicely.

Plenty of room in the box for a tube pre stage and

transformers. Built in a black 19" rack enclosure, this amp is suitable for studio use.

See the whole project here: http://xtremetronics.blogspot.com/p/mcallister-gain-clone.html