Attempt at circuit - need review please - Page 2 - Electronic Circuits Projects Diagrams Free

richacm · 22nd May 2008, 07:46 AM

Wow, this is starting to look quite cool.

Anyway I ramped up the 5V to 10V on the sensor and used that voltage on the Op-Amp also. I've going to have to get my head around the calcuations so I can calc the Resistors properly (I've left them as they were for the 5V supply).

How did you come up with 3.1V for the sensor? I made out that it was 5V ...do the diodes reduce the voltage?

Unfortunately I think I am still way off from a finished circuit.

Cheers,

Craig

audioguru · 22nd May 2008, 03:59 PM

Your switching stepup regulator is drawing too much current through the 1k resistor that feeds the zener diode which drops the 5.1V way down.
The diodes drop the voltage to the sensor by about 0.65V each.
The 91k resistor feeding the sensor drops its voltage way down.

richacm · 23rd May 2008, 04:15 AM

OK, thanks. I was wondering if the step up voltage component was going to be a headache. Should I start with a 12V supply and place a zener diode to get it down to 10V? Then step down again with another 5V zener to get a 5V supply?

audioguru · 23rd May 2008, 04:58 AM

Quote:

Originally Posted by richacm

OK, thanks. I was wondering if the step up voltage component was going to be a headache. Should I start with a 12V supply and place a zener diode to get it down to 10V? Then step down again with another 5V zener to get a 5V supply?

Yes, that would be smart.

BaCaRdi · 23rd May 2008, 06:10 AM

Yeah I like it!

Good work Craig.

-BaC

Quote:

Originally Posted by richacm

Wow, this is starting to look quite cool.

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22nd May 2008, 03:59 PM	(permalink)
audioguru	Your switching stepup regulator is drawing too much current through the 1k resistor that feeds the zener diode which drops the 5.1V way down. The diodes drop the voltage to the sensor by about 0.65V each. The 91k resistor feeding the sensor drops its voltage way down. __________________ Uncle $crooge

23rd May 2008, 04:15 AM	(permalink)
richacm	OK, thanks. I was wondering if the step up voltage component was going to be a headache. Should I start with a 12V supply and place a zener diode to get it down to 10V? Then step down again with another 5V zener to get a 5V supply?