Stabilizer PCB Construction

Step 1

Inside the polygons are all the resistors and capacitors. A 2 meg resistor is not used, included in some kits.

The 2.2 mfd capacitors around the CA3140 have been changed to 2.0 mfd. Put the two capacitors that are square and marked 205 in those locations.

Use a Volt-Ohm Meter to double check resistor values. The proper placement of the 4.7 meg resistors is very important. If a lower value gets here, the stabilizer will not work.


Quantity Type Value
2 1/4 Watt 100 ohm
1 1/4 Watt 330 ohm
1 1/4 Watt 1.2K
1 1/4 Watt 4.7K
4 1/4 Watt 22K
6 1/4 Watt 100K
2 1/4 Watt 4.7 Meg


Quantity Type Value
12 Disc .01 (.0068)

Non-Polarized, Tantalum

2 Non-Polarized 2.0 mfd Mono/Film
1 Tantalum 10 mfd (3 pin)


1 Electrolytic 330 mfd

Step 2

Install the 7805 regulator, two diodes, one LED, T1-1T transformer, and 32 MHz oscillator.

Diodes and LED

Quantity Type Part Number
1 LED Bright Red
2 Small Signal Diode 1N914 (1N4148) (Black Band)

Transformer Core/Oscillator/Regulator

Quantity Type Part Number
1 1:1 Transformer Mini-Circuits T1-1T
1 Oscillator Can 32 MHz
1 5 Volt Regulator 7805

Step 3

Solder the ICs, transistors, CA3140 op amp, and the MOSFET to the PCB. IC sockets are not included with the kit, but may be used if desired.

Active Devices

Quantity Type Part Number
1 NPN Transistor 2N3904
1 PNP Transistor 2N3906
1 CA3140 Op Amp
2 74HC4020 IC
1 74S74 (74F74) High Speed IC

Step 4

Connect wires between the "Q", the "P", 12 Volt and 5 Volt boxes.

There is a wire between the 12 Volt boxes, it just got perfectly hidden by the other wires in this picture.

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Last Update: 8/13/06
Web Author: David White, WN5Y Free Website Translator