heat generating circuit with 9v battery

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sawadeejar

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Dear all,

Anyone has an idea how to build heat generating circuit with 9v battery?
This schematic found at HOW TO GET WHAT YOU WANT using 24v supply. I wonder how to modify it to work with 9v instead of 24v power supply.

Thanks.
 

Hi,

What is the heating element resistance. Is it a DC heating element. The mosfet cannot support more than 2Amp.

Thank You
 

prmurthy said:
What is the heating element resistance. Is it a DC heating element.
Click to expand...

It's conductive thread 14 OHM per foot. Here it's **broken link removed**

Yes it's a DC heating element.


prmurthy said:
The mosfet cannot support more than 2Amp.
Click to expand...

What does this mean?
Has this got to do with the power supply? Does this mean that other than 24v can not be used with this schematic?
 

Thank you for the reply.

What if i keep the 24v as it is. What is the resistance of heating element should be?
 

Hello Dear Friend

What you want is a Heater and What you are showing is a conductive cloth thread. This conductive thread is not suitable for heater. This is suitable for your shirts where you want to glow some LEDs etc. Examples you can find in most of the club dancers cloths with lights etc.

Thank you
 


Yes you're right the conductive thread is for clothing. I'm working on a soft circuit which will be embedded in a t-shirt.
 

sawadeejar said:
Thank you for the reply.

What if i keep the 24v as it is. What is the resistance of heating element should be?
Click to expand...

for mosfet max current to be 2A the minimum value for resistance of the heating element should me R = V/I => 24/2 = 12 ohm
 
Thats a good circuit, though you might want to connect a 100nf capacitor accross both of the transistor collectors, esp if you building this into a item of clothing using wire traces.
I'd use an IRF 540 mosfet, they are bigger an easier to work with and will take more abuse and can handle more current.
A 9v battery isnt going to last long at all generating even a small amount of heat, I'd be looking at using a small lead acid battery or a pack of Nim rechargeables.
 
Thank you all for your advices. It's enough for me to get started now.
 

dr pepper said:
Thats a good circuit, though you might want to connect a 100nf capacitor accross both of the transistor collectors, esp if you building this into a item of clothing using wire traces.
Click to expand...


I attach a modified circuit.

Can you please explain a little more?
Why the capacitor should be put between these transistors?
 

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