The attached pic is the the small pcb of a (typical?) cheapo quartz clock. The output is 1 pps but the polarity is reversing. I believe it's basically a current drive but the open circuit amplitude of the pulses may be about 150mV. I can't fathom out the relationship between the o/p voltage and and the 1.5v supply.
I's like to use it to drive an industrial style clock that requires alternating polarity pulses of 24v. at about 250mA. If they were simple uni-directional pulses it would be easy to amplify them to 24v... but I can't even start to think how to do it. Any thoughts ?

 

the open circuit amplitude of the pulses may be about 150mV

How did you determine that?

 

Use comparator supplied from dual power source (+24 and -24V). The inverted input feed with signal and noninverted connect to Gnd (middle point of +-24V source).

 

With an oscilloscope.. I couldn't get a proper display but occasionaly could seea didplacement that might have been 3 divisions 50mV..

 

With an oscilloscope.. I couldn't get a proper display but occasionaly could seea didplacement that might have been 3 divisions 50mV..

That seems a rather low voltage.
Exactly between what two points did you measure that?

 

Probably not the IC in the clock circuit, but likely similar:

https://www.emmicroelectronic.com/s...cts/datasheets/1344-DS (updated Nov 2022).pdf

The "motor" output is differential to allow alternate polarity drive from a single 1.5 volt supply.

 

That seems a rather low voltage.
Exactly between what two points did you measure that?

you were right to doubt crutshow, I'm a dumbass.. Forgot the probe was 10x att. So the pulses are battery voltage likely outputed from an H bridge. I guess the output connections (where the stepper coil was connected) are open circuit between pulses ?

 

Progress...A plan is evolving.. I've determined that positive going pulses of 1.5 v(relative to the 1.5 battery -ve) are outputing alternately from the two conection points that previously fed the stepper motor coil.
I could convert these to 5v logic level with a dual comparator LM393. These could feed a small chinese H bridge fed with 24v from a Chinese step up converter..
I should have put "I think" in front of all those. Does this seem workable ?

 

I guess the output connections (where the stepper coil was connected) are open circuit between pulses ?

Would appear so.

Does this seem workable ?

Likely.
Post the circuit schematic of exactly what you are going to do, and we can give you a more definitive answer.

 

Because of the helpful suggestions received I think/hope this diagram will work ?
Actual progress has stalled after my test to see what voltage the quartz clock pcb would work up to. It expired at +4.5v :-(
I am seeking a replacement..