I am in need of some help. I have a heating mat that I'm wanting to disable the auto shut off feature. The IC number is HCF4536BE or GK7411EJ. The closest mach I found was http://www.alldatasheet.com/datasheet-pdf/pdf/177156/STMICROELECTRONICS/HCF4536BEY.html

I've already disabled pin 7 (clock inhibit input) and 3 (External clock Input) with no success. Can anybody tell me which pin controls the auto shut off.

 

Depends how its configured, could be by disabling the set pin1,reset pin 2 or osc inhibit pin 14,

 

Depends how its configured, could be by disabling the set pin1,reset pin 2 or osc inhibit pin 14,

Would it help if I took a pic? I disabled pin 1. Now I wait.

 

Would it help if I took a pic? I disabled pin 1. Now I wait.

yes take piccys and post

 

Try MC14536

http://www.onsemi.com/pub_link/Collateral/MC14536B-D.PDF

 

I haven't studied the datasheet in depth, but would disabling any of those pins actually cause the IC to shut off? That's the opposite of what is wanted.

Edit: Ok, after checking the sheet further it seems holding pin 1 high and pins 2,7,14 low will cause the output (pin 13) to stay high (=on).

 

OK thanks for the reply everybody.

Sadly, I shorted out the circuit. Ops... So, now I'm in need of curcuit that that can power the heating element safely.. Would it be as easy as a Potentiometer, a couple resistors, diode??? Except I have three wires coming out the heating pad. I can assume the third one is the thermometer.

Any help would be appreciate. I no I could purchase a light dimmer but those are 10 plus bucks. If I were to do that I would just purchase another heating pad.

Edit: I just need it on a "High" setting.

 

It might not be safe to ignore the thermometer wire. The pad could overheat if powered uncontrolled. Depends on the design/spec (unknown).