Relay question

Jim Brain brain at
Fri Nov 28 16:49:08 CST 2014

On 11/28/2014 4:09 PM, Peter Coghlan wrote:
> I have come across a relay like this controlling the door of a bus. 
> One push to make switch, push once to open, push once to close. The 
> bus schematics called it an "impulse relay". This is East of the 
> Atlantic - who knows if they they call it the same thing where you 
> are. The one I came across was 24V rather that 12V too. (There were no 
> classic computer systems on the bus, unless you count the radio system 
> which allegedly tracked the bus location and radioed it back to the 
> controller. It counted pulses from the speedometer/odometer 
> tachogenerator and did 4 bit BCD arithmatic on them using 4000 series 
> CMOS.) Regards, Peter Coghlan. 
I'll see if that set of words helps me.  Google was not all that useful 
last night.

I'd like to find something and get it here within the week, as they are 
coming back, and I'm hoping to test it out before I give it to him to 
install in the unit.


Jim Brain
brain at

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