Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "daemons_ca" <daemons_ca@...> wrote:
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> Good info on toner temps. Thanks.
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> I think the TL901 is too low in temperature to use for transfer "as-is" (according to their specs), but I want to get one and have a look at the existing circuit. The pdf posted by josemj1 on modding this model looks interesting, but I'm not sure a new temp controller is required. If the TL901 uses a diode as it's sensor, then it's probably possible to bias the circuit to raise the temp up to 315F. If not, I think I'll have a look at your GBC temp controller and see if it can be used/adapted for the TL901. I don't have a nifty IR thermometer though. Maybe something I should look at getting first.
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> I also found a GBC H212 used, non-working. I don't know if it's a good model for PCBs, but it looks like it can be easily modded for the temperature. I hope it's just the fuse, or the temp cut-off and not the control circuit.
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> Marc
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It works out of the box, but modifying it did make a noticeable improvement. The temperature sensor looks like a diode but is actually a thermistor, the circuit is very simple, just some comparators, resistors, and a triac to control the heater.