Description.
Here is a simple heater circuit that can be operated from a 12V battery. The first part of the circuit is an astable multivibrator build around the two transistors Q1 and Q2 .The ON time of transistor Q2 is set to 0.5 S. The ON time of transistor Q1 can be varied by using the POT R2.The output pulses at the collector of Q2 is used to drive the Darlington power transistor Q3(TIP122).The transistor Q3 drives the heating elements L1 to L3.The net heat produced can be varied by selecting the desired combination of heating elements at the output circuit sing switches S1 and S2.The net heat can be also varied by varying the duty cycle of the triggering pulse using POT R2.
Circuit diagram with Parts list.
Notes.
- The circuit can be assembled on a general purpose PCB.
- The transistor Q3 must be fitted with a heat sink.
- The elements L1 to L3 can be 10W heating coils.
- The switches S1 and S2 must be able to withstand at least 5A.
- The circuit can be powered from a 12V battery.
- The LED D1 gives a visual indication of the duty cycle of the circuit.
36 Comments
Like this design very much! I can recommend this to our clients, by the way, what’s the capacity of the 12V battery?
please provide the details of heating coil;is it available at market….?
can we use soldering heating coil….?
great circuit… and great article
Was a very nice circuit
with this i and my freinds when nights come out home and Sit together use it and very pleasur.
Sir can i use this on ac to dc converted supply ? and what output is required for that and also send me the Details of Item is required for that project. (capacitor & Resistor)
pls does any type of amp for 12v work for this circuit pls
pls what is the meaning of the 1.5m and 4.7m in this circuit because i dont know the meaning of the m
Seetharaman, i have TIP41, can i also use it as replacements for TIP122
Hi Rex TIP41 is a NPN transistor with just 6Amps absolute maximum collector current and a current gain of just 30 to 70. You have to use this with 2N3055/BD182 as darlington, of-course TIP41 in the input side.
Seetharaman, what are other replace for TIP122
The equivallents are MJ802, MJ3001, 2N6283, BDX54, BDX69, or simply a BD139 with BD182 or 2N3055 as discrete darlington can be used.
Up to what temperature can it reach?? pls answer..
sir
very nice popular website……
i am live your website..
thanks sir
Sir,
I need a running LED circuit with speed control and how to expand the number of LED?Please send me.
Is this heater is used for heating water…plz give reply
is this water heater?,can i increase battery voltage to make it more suitable larger home use? I am most grateful. Please do reaply.
This is not a water heater. this is a small constant temperature chamber for calibration of rtd thermisters etc.
how can run and store microcontroller pic and ATMEGA16 AND ATMEGA33 AND HOW STORE DATA IN MC.
HOW DESIGN USING MICROCONTROLLER(89C51) TO RUN (BLINKING) 100LEDS .Please sent program in my mail.
I like this.thank you for the circuit
Good,I like this
Hi is this water heater which is discussed here
Can i use 12 V adapter to power the Circuit. If i am using 12v adapter in circuit then whats the power consumed for 1 hour/day.
using of 3*10w coil requires 30w/hr
Hi Kulwinder the battery should be connected between +12 and common ground.
Hi Wash each heater has got a capacity of 10watts. a total of 30watts energy is available.
Hey I’m building a project which involves a DC heater. I would like to find out how hot this call actually get. Thanks
huy guys i have read all the circuit but i am unable to understand that where battery ‘s output nodes
thnk for your info… but i want a small battery like 12v..
Hi ABDS with a car battery of 40AH it will work for 12 to 24 hrs depends on the heating required.
how long this battery can survive?
Dear writer
Just wonder who many degrees C can it provide as a maximum
thanks
hiii how r u???
thanks very nice circuit
I really appreciate your effor. \pls kindly send me details on how to design and build 1000watts inverter/ ups
Is this heater is used for heating water?If so what will be the output temperature ?can we use this for space heating?What is the battery back up?
Thanks very nice project but u didnt mention the current ratings of the battery to be used like 12v@10amp,12v@12ampsetc.moreover the output temperature is not mentioned
I tested the circuit using a 12V,7Ah battery from my motor cycle.
Thanks for the message , but i also need the circuit diagram of 50 watt amplifier with double input and output and all neccesary information about it. thanks and GOD bless you