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Welcome to the home page. This is consulting engineer Masatoshi Katsube's home page.
I service semiconductor Quality Assurance support in Japan for foreign semiconductor company or analog circuit design as usual.

Here is documents download service page.
You don't need charge for the document except in case of necessity of the copyright.
When you have any question of the copyright for the documents in this page, please contact me.

Transistor Meter

The Transistor Meter is Transistor characteristics test equipment. This meter use for DC and (270[Hz] to 1000[Hz] of) AC small signal testing for BJTs, JFETs, MOSFETs and Dual Gate FETs.

This meter use PSD (Phase Sensitive Detector) for AC measurement because measurement signal is micro volt level of small signal. However you can use DC voltmeter even analog multi-tester after building. Unfortunately, this is difficult project for beginners, because an error of the AC measurement occur by stray capacitance.

Small signal BJTs and FETs are use for a circuit that expose higher voltage spikes (ex. ignition of the vehicle and Electric Static Discharge at input/output of the equipment). And also cite low-cost products or products that has long term of life cycle. If you have performance failure of transistor circuit, you can find the mechanism smoothly when you have transistor meter. The transistor meter use for these situations.

The document is 29 pages of pdf file and file size is 363kB (334kB for zip). This document include circuit diagram and explanation of each circuit block.

August/15/2009

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AM Radio Transmitter
(The First Quadrant Modulation)

Here is an AM radio transmitter.
"The First Quadrant Modulation" is a coin age that come from the operation of the modulator.

The features are Better Sound, 3 Volts Battery Operation, Easy Circuit and DC Modulation.

You can watch the operation of the transmitter on YouTube.

The document is 13 pages of pdf file and file size is 337kB (314kB for zip). This document include circuit diagram and explanation of each circuit block. You can build it!

May/03/2009

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Linear LED Brightness Controller

Do you have felt non-linearity when you try LED brightness controller? If you use PWM, you will feel non-linearity because your eyes has logarithm. Here is a Linear LED Brightness controller that uses anti-logarithmic current. I call "Anti-Log Drive"

You can watch the operation of the controller on YouTube.

The document is 8 pages of pdf file and file size is 140kB (132kB for zip).This document include circuit schematics and explanation of each circuit block. You can build the same one.

April/16/2009

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Knight Rider Light Scanner

Here is a Knight Rider Light Scanner. It has Trailing Light of course!
You don't need sense of computer devices and environment of the computer system, micro-controller development tool for example. If you have experience of building electric circuit, that's fine.

You can watch the operation of the scanner on YouTube.

The document is 7 pages of pdf file and file size is 123kB (116kB for zip).This document include circuit schematics and explanation of each circuit block. You can build the same one.

April/12/2009

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Quiz Table

Here is a Expandable & Cheap Quiz Table Controller that uses analog devices.
You don't need sense of computer devices and environment of the computer system, micro-controller development tool for example. If you have experience of building electric circuit, that's fine.

You can watch the operation of the controller on YouTube.

The document is 6 pages of pdf file and file size is 123kB (117kB for zip).This document include circuit schematics and explanation of each circuit block. You can build the same controller.

April/08/2009

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Traffic Lights Controller

Here is a traffic lights controller for models or toys that uses analog devices.
You don't need sense of computer devices and environment of the computer system, micro-controller development tool for example. If you have experience of building electric circuit, that's fine.

You can watch the operation of the controller on YouTube.

The document is 8 pages of pdf file and file size is 132kB (124kB for zip).This document include circuit schematics and explanation of each circuit block. You can build the same controller.

March/27/2009

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70s MORSE CODE DECODER

This is a Morse code decoder that doesn't use computer technology. I think this decoder is possible to build with 1970s devices. From this, I named 70s. So you don't need special tool (ex. development tool of micro-controller) for building a decoder, just regular tool set (ex. soldering tool) is OK.

It uses analog/digital devices (ex. operational amplifiers, bipolar/MOS transistors, 74-series logic devices).

You can watch the operation of the decoder on YouTube.

The document is 19 pages of pdf file and file size is 319kB (297kB for zip).This document include circuit schematics and explanation of each circuit block. You can build the same decoder.

March/23/2009

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Contact information :

Name : Masatoshi Katsube (male)
Address : 5-3-5-302 Ozenji-nishi Asao-ku Kawasaki city Kanagawa 215-0017 Japan
e-mail : Click here to appear mail form.

I appreciate your coming.
Thank you

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