The AA8V 6x2C Crystal Controlled Converter
by Greg Latta, AA8V

AC Primary Circuit Schematic Diagram and Circuit Description

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Schematic Diagram and Circuit Descriptions Page

Introduction:
The primary wiring of the 6x2C crystal controlled converter is straightforward. A grounded 3-wire cord supplies power and keeps the chassis grounded at all times in case of a component failure. A fuse protects against excessive current draw, and a power switch, section S1A of the Mode switch, applies primary power in the Standby and Run modes. A pilot light that matches the one on the 6x2 receiver indicates when the power is on.

The transformer is a small unit salvaged from a gutted Heathkit VTVM.

Important Note:
The original schematic shows the power from the cord first passing through the mode switch, then through the fuse. However, good engineering practice dictates that the power from the cord should pass first through the fuse, then through the switch. The actual wiring follows good engineering practice, and the schematic on this page has been changed to show the correct, actual, power wiring.

AC Primary Circuit
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AC Primary Circuit:

3-Wire Grounded Cord: The 6x2C converter is powered by a 3-wire grounded cord. The third wire keeps the chassis connected to ground. If any component should short to ground, the chassis remains at ground potential, protecting the operator.

Fuse: A fuse in the hot lead of the AC supply protects against excessive current draw that could damage components or start a fire.

Mode Switch: One section of the Mode switch is used as a power switch. Power is applied to the transformer primary in the Standby and Run positions of the Mode switch.

Pilot Light: A pilot light indicates when power is applied to the converter. The pilot light is the same as that used on the 6x2 receiver.

Power Transformer Primary: The transformer is a small unit salvaged from a gutted Heathkit VTVM. The approximate transformer ratings are as follows: Primary: 117V at 60Hz HV Secondary: 125V at 15mA Filament Secondary: 6.3V at 0.75A

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If you have any questions or comments, you can send E-Mail to Dr. Greg Latta at glatta@frostburg.edu