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Subject: Re: [Homebrew_PCBs] WHAT is K1 1mH 400 ohm

From: James <bitsyboffin@...>
Date: 2017-01-02

I would say it is a relay. 

The box is the coil which has 400 Ohm resistance and 1mH inductance

I don't know why they specified the inductance of the coil, I can't imagine it's really important, probably it's just what they had.

Since said coil is shown as powered from 12v, and we know it's 400R, it will be around 25-30mA when the transistor below it is saturated.

On Mon, Jan 2, 2017 at 4:35 PM, Rob roomberg@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
 

What is the component labeled K1 1mH 400 ohm on the right side of this
schematic?

http://www.learnmorsecode.com/ laminator/gbc/pp330.jpg