Timeline for Can I use relays for heating element?
Current License: CC BY-SA 4.0
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| Jan 18, 2021 at 4:04 | history | edited | D.A.S. | CC BY-SA 4.0 |
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| Jan 18, 2021 at 4:03 | comment | added | D.A.S. | I did not suggest any relays and a ZTX450 drops only 20mV @ 71 mA ($0.81). (Rce<0.3 ohms) while A low threshold FET with 1.5V needs a Vt= about 0.7V to have this resistance to conduct well at 1.5V, These ONLY come in SMD packages and cost about the same with about the same performance. Rb for the BJT needs to conduct about 7mA. or ~R= 2.3V/7m~300 ohms and with PWM controls the average current to be the correct temperature. | |
| Jan 17, 2021 at 21:45 | comment | added | Gil | Note: Relays do not PWM very well at cycles under x minutes. The avalanche rated MOSFET is your best choice then fast PWM cycles are no problem and no diodes. It appears you are using a single cell battery at just less than 1.5V. The BJT will have a forward CE voltage drop of either 0.7 or 1.4 volts, not leaving much for the nichrome wire. | |
| Oct 8, 2020 at 2:51 | history | answered | D.A.S. | CC BY-SA 4.0 |