XCVG said:PTH08080 is newer and works up to 18 volts input vs 14 volts for the PTH08000. It has a different pinout as well, other than that they are essentially the same. I believe it require a 100uF capacitor but it may be a 10uF. A 1.8K resistor will get you exactly 3.3V or a slight undervolt, a 2.2K resistor will give you around 3.1V, a significant but acceptable undervolt. 2.0K is a nice middle ground, but hard to find; the easiest to find is 2.2K but I have seen 1.8K as well, 2.0K I haven't seen much.
Joeyjoe9876 said:XCVG said:PTH08080 is newer and works up to 18 volts input vs 14 volts for the PTH08000. It has a different pinout as well, other than that they are essentially the same. I believe it require a 100uF capacitor but it may be a 10uF. A 1.8K resistor will get you exactly 3.3V or a slight undervolt, a 2.2K resistor will give you around 3.1V, a significant but acceptable undervolt. 2.0K is a nice middle ground, but hard to find; the easiest to find is 2.2K but I have seen 1.8K as well, 2.0K I haven't seen much.
2 1K's in parallel does the trick.
XCVG said:Joeyjoe9876 said:XCVG said:PTH08080 is newer and works up to 18 volts input vs 14 volts for the PTH08000. It has a different pinout as well, other than that they are essentially the same. I believe it require a 100uF capacitor but it may be a 10uF. A 1.8K resistor will get you exactly 3.3V or a slight undervolt, a 2.2K resistor will give you around 3.1V, a significant but acceptable undervolt. 2.0K is a nice middle ground, but hard to find; the easiest to find is 2.2K but I have seen 1.8K as well, 2.0K I haven't seen much.
2 1K's in parallel does the trick.
DO NOT DO THIS! 2 1Ks in parallel is NOT 2K. I forget what it works out to, but two resistors in parallel is less than one resistor. It sounds odd but it's true.
You're thinking of series.