an array of 8 individually addresseable NPN transistors

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In order to allow to use arbitrary type and number of simple tools such as low power electronics (LEDs, fans, etc) in experiments, a set of 8 switch arrays was developed. The 8 pin version utilizes a 74HC595 shift register, allowing to connect more components with less amount of pins. The power fed to the element being switched can vary from 5 to 12 volts.

An 8 switch array behaves exactly like a 74HC595 shift register but transistor switches allow bigger currents to flow through given loads

Do not connect or disconnect connectors while power is ON. All adjustments must be done ONLY when power is OFF.

Current design of 8 switch version: