More DIY EGOR

Bernd Felsche bernie at innovative.iinet.net.au
Mon Nov 20 08:55:17 GMT 2000


Floyd Wilk tapped away at the keyboard with:
> Bruce,
> 
> You have transistors Q2 and Q3 tied together. Then you have both connected
> to +2.5V? I am assuming you meant to connect Q3 to -2.5V instead.
> 
> You may have to rethink using an LM124 as a "split supply" ground. It can
> only sink about 10mA of current. Even though the typical value is about
> 20mA, you can not count on that. If you can guarantee that your entire
> circuit will not sink more than 10mA, than you will OK. If you ever decide

If the circuit is mainly providing the pump cell current, then the
order of magnitude is more than adequate based on previous
discussions of the NTK WBEGO sensor.

(Sorry, haven't got the OK from Bruce yet to take a look without
feedback to the GM list.)

> to redesign the power supply, you can build a rock solid "split supply" for
> about $1.00. Same cost of the 7805? You can get two LM317LZ from DigiKey for
> $.53 each. These are 100ma variable voltage regulators. Just add a few
> resistors and capacitors.

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