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Andy Neil
12/29/05 08:08
Read: 499 times

#106164 - More detail
Responding to: Suresh R's previous message
I said:

Do you simply want a variable-power supply to a 9V heater element (nominally 90W)?

Suresh R said:
Yes. Can i know the steps involved in making it.

As has already been mentioned, the simplest way to just vary the power is to simply turn off the supply for a certain number of cycles:
100% Power = All cycles turned on;
50% Power = Half of the cycles on, half off;
10% Power = 10% of cycles on, 90% of cycles off;
etc, etc

Actually, it's probably easier to do on a half-cycle basis; eg, this is easily achieved by triggering a triac at the start of the 'ON' half-cycles

Note that this just varies the input power to the heater (just as your variac did) - it does not control the temperature.

List of 11 messages in thread
Variac Alternatives      Suresh R      12/27/05 02:29      
   heater coils      Erik Malund      12/27/05 07:05      
   Why?      Andy Neil      12/27/05 19:57      
      Actual Requirement      Suresh R      12/27/05 23:27      
         large heavy pcb      Terry Lingle      12/28/05 06:23      
            My thought too !      Steve M. Taylor      12/28/05 06:49      
      variable - power supply      Suresh R      12/28/05 23:06      
         More detail      Andy Neil      12/29/05 08:08      
   Maybe it's too simple, but -        Hal Albach      12/29/05 08:06      
      sweet!      Erik Malund      12/29/05 08:36      
      It works for me!      Andy Neil      12/29/05 12:27      

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