How to Build a Simple 1-25 VDC, SPST NO, 0.05A 1-70 VDC Relay for Under $4

by qazwsx755 in Circuits > LEDs

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How to Build a Simple 1-25 VDC, SPST NO, 0.05A 1-70 VDC Relay for Under $4

In this Instructable I will show you how to build a 1-70 VDC, SPST NO, 0.05A 1-70 VDC relay for under $4.

Gather Materials

Here is a list of things you need for the Instructable.
1-IR led 1.99
1-IR photo transistor 1.59
(they must be IR or the resistance will never stay the same).

Tools
electrical tape

Building the Relay

First tape the IR led IR photo transistor together. Then bend all four leads down.

Using the Relay

First connect the correct resistor (1-10v=8.2ohm,11-20v=150ohm, 21-25v=180ohm) from negative in to the negative on your supply. Then connect the positive in to the positive on your supply. After that connect the 2 positive in to the positive on your 2 supply and the 2 positive out to whatever you want. Thanks for taking a look at this Instructable please vote for it in the LED contest.