Airflow-Controlled Dual Heater PCB
Budget: £20 – £250 GBP
I need a simple and rock-solid analog circuit that drives two 24 V DC heater coils from a single supply. The secondary coil is always energised (between 15-30 Watts) and doubles as an airflow sensor: its resistance drops as it cools, and that change must be converted into a control voltage. That voltage, in turn, has to modulate the power sent to the primary coil (up to 10 A) which is in the same airflow and close to the secondary coil. An adjustable gain/resistor/knob is required to manually calibrate the control voltage vs amount of power to the primary coil. Entirely with discrete, reliable parts—no microcontrollers, firmware, or software tweaks.
Its not a big job, scope of work is only the control circuit and does not include the heaters or power supply.
What I’d like from you
Complete schematic showing the sensing network, amplifier/conditioning stage, power stage and any protection you feel is essential for a heater handling 24 V at 10 A.
• PCB layout ready for manufacture—Gerber, drill files, solder-mask, silkscreen and pick-and-place data.
• Bill of materials with reference designators, part numbers and suggested suppliers.
• Brief test notes or acceptance criteria so I can verify proportional response and current handling on the bench.
Keep the component count low, choose parts with generous derating, and route the board so copper areas comfortably carry the heater current without hotspots. I’m happy with through-hole, SMD or a sensible mix—whichever best meets reliability and cost goals.
If you have prior experience with heater control, analog sensing or high-current PCB design, your insight will be invaluable.
Its not a big job, scope of work is only the control circuit and does not include the heaters or power supply.
What I’d like from you
Complete schematic showing the sensing network, amplifier/conditioning stage, power stage and any protection you feel is essential for a heater handling 24 V at 10 A.
• PCB layout ready for manufacture—Gerber, drill files, solder-mask, silkscreen and pick-and-place data.
• Bill of materials with reference designators, part numbers and suggested suppliers.
• Brief test notes or acceptance criteria so I can verify proportional response and current handling on the bench.
Keep the component count low, choose parts with generous derating, and route the board so copper areas comfortably carry the heater current without hotspots. I’m happy with through-hole, SMD or a sensible mix—whichever best meets reliability and cost goals.
If you have prior experience with heater control, analog sensing or high-current PCB design, your insight will be invaluable.