What is it?

The kit supplies components to build a transistor based logical NOT gate with an indicator LED. The NOT gate design is similiar to that used in TTL circuits. The input pin connects to the emitter of a steering transistor which feeds an output transistor and LED indicator. The fan-out is good which enables the NOT gate to drive multiple other gates.

With just a couple of NOT gates it is surpising what one can do with them. The documentation describes how to make a simple flip-flop and and two different kinds of oscillator (feedback and relaxation) from a couple of NOT gates hooked up together.

NOTE: This is a kit that requires basic soldering skills.

Why did you make it?

I'm interested in retro computing using transistors.

What makes it special?

Unlike many transistor gate designs this is similar to TTL based designs.

Specification:

• Board Dimensions: 1 inch x 1.1 inches
• Input voltage: 4.5 to 9 Vdc depending on application
• Maximum current draw: 5 mA
• 3mm (M3) screw holes at the corners
• Pin connectors are spaced such that the board can be optionally plugged into a breadboard

What's in the box?

• PCB Board
• Three 2N3904 transistors
• Four resistors
• One capacitor
• 2 x three pin connector
• 3 mm LED
• Eight page assembly and how it works manual

NOTE: This is a kit that requires basic soldering skills.