Page 1 of 1

Electrical cct

Posted: Mon May 07, 2018 9:00 pm
by Shaggy1505
Hi I have built the cct shown below I have modified it slightly by including a 10v motor, on/off push button switch and 2 9v batteries as the power source. The problem I have is after a few seconds of operation the batteries get extremely hot, I am unsure what to do to prevent this from happening. I would really appreciate any help/advice.

Re: Electrical cct

Posted: Tue May 08, 2018 2:16 pm
by David
Hot batteries mean that an excessive current is being drawn by something in the circuit. Do you have a meter capable of reading volts and amps? Have you checked the built circuit against the schematic? Do any other components get hot? Crucially - what sort of motor are you trying to operate? Are you using the small PP3-type batteries?

Replace the motor with a 1K resistor and see if the batteries still get hot.

It would be of use to see a pic of the batteries and the motor.

Re: Electrical cct

Posted: Sat May 12, 2018 12:03 pm
by MichaelBo
Hi David, could it mean that the batteries are malfunctioning as well? The schematic checks out from what I gathered. I'm just thinking out loud, really.

Re: Electrical cct

Posted: Thu May 17, 2018 8:46 am
by David
The batteries may well have been damaged by excessive current drain and heating. If you want any more assistance, please post the answers to my questions in the earlier reply.