IV+ zener diode question...MARKO!! HELP!!!
Posted: Sun Mar 26, 2006 12:12 am
MARKO
At least it always used to be Marko who was so helpful there. I just now finally got around to assembling MAX IV+. It was ordered a while ago and might have been one of the first to ship. There were a few part substitutions, no big deal and I figured them all out, but I want to check on this last one. The bill of materials specifies D2 as 12V Zener and D3 as 11V Zener. I received a 9.1 and an 11 (C9V1PH and C11PH). Part of me is guessing that these parts just set up a reference difference and I should just put the higher voltage in D2 position (D2=11V, D3=9.1V). But another part of me wonders if the C9V1PH just got in the wrong bin by mistake.?????
The only other part substitution I want to check on is that I received a 4MHz xtal in the LCD kit, identical to the one in MAX IV+ kit, instead of 6.4MHz as in instructions for LCD...problem?????
Last question. I broke thermistor R38 (NTC 33k) trying to move it closer to the heat sink, stupid, I know, I have to order new part by mail and it will be a couple weeks and I don't want to wait to test MAX IV+. Can I substitute a normal 33K resistor temporarily and be careful with heat??
Thanks in advance, you have always been very helpful in the past
Aurora
At least it always used to be Marko who was so helpful there. I just now finally got around to assembling MAX IV+. It was ordered a while ago and might have been one of the first to ship. There were a few part substitutions, no big deal and I figured them all out, but I want to check on this last one. The bill of materials specifies D2 as 12V Zener and D3 as 11V Zener. I received a 9.1 and an 11 (C9V1PH and C11PH). Part of me is guessing that these parts just set up a reference difference and I should just put the higher voltage in D2 position (D2=11V, D3=9.1V). But another part of me wonders if the C9V1PH just got in the wrong bin by mistake.?????
The only other part substitution I want to check on is that I received a 4MHz xtal in the LCD kit, identical to the one in MAX IV+ kit, instead of 6.4MHz as in instructions for LCD...problem?????
Last question. I broke thermistor R38 (NTC 33k) trying to move it closer to the heat sink, stupid, I know, I have to order new part by mail and it will be a couple weeks and I don't want to wait to test MAX IV+. Can I substitute a normal 33K resistor temporarily and be careful with heat??
Thanks in advance, you have always been very helpful in the past
Aurora
