Where electronics enthusiasts find answers.
sparky wrote: The im-precision of the voltage regulator carries through to the thermocouple amplifier and finally to the ADC on the PIC. As long as all line are steady (lots of decoupling caps) we are ok. If the VDD line is 4.95V or 5.12V, doesn't matter...Are you sure?
How is a triac better than a relay?No sparks or mechanical fatigue. 1500Watts can be handled by a Q4025L5 triac driven by a MOC3011 triac driver - all for less than $4 from Jameco. No snubber is needed because the load is not inductive. See http://www.fairchildsemi.com/an/AN/AN-3003.pdf
rglissmann wrote:Keep in mind that a triac driving a 1500W 120V load would itself dissipate about 15 watts. This would require a decent heatsink, whereas a mechanical or solid state relay runs fairly cool. That level of dissipation may be hard to get out of an insulated tab pkg too, so the heatsink would either need an insulator pad or the heatsink would be electrically hot.How is a triac better than a relay?No sparks or mechanical fatigue. 1500Watts can be handled by a Q4025L5 triac driven by a MOC3011 triac driver - all for less than $4 from Jameco. No snubber is needed because the load is not inductive. See http://www.fairchildsemi.com/an/AN/AN-3003.pdf
Oznog wrote:The main benefit behind a triac might be its ability to reduce the power without resorting to harsh on/off cycles. Has anyone seen a need for this?I believe that using a PID control algorithm, you can maintain a much tighter control on the temperature. Harder to do this with a relay and I suspect a much shorter operating life (chattering contacts don't last as long). By the way, phase control is not really needed for this application when using a triac.
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