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In Reply to: RE: Diode Biasing using other than LEDs posted by Maxamillion on July 01, 2009 at 13:34:33
If we really think of the impedance while still maintaining a certain bias, then I think battery bias must come into consideration. I've always liked the sound of battery bias, but really never understood why.I think that it may be that you can retain a certain negative bias, while presenting a very low AC (signal) impedance to ground, without the coloration of a bypass cap. The internal resistance of a NiMH battery is extremely low, and 2 of them in series will get you about 2.4V of negative bias, which seems to be close to your target. Here is a Wiki link that gives a chart to the various batteries. Seems as if you could achieve a -2.4V (two 1.2V cells in series) bias with an internal resistance of less than 14 milliohms.
twystd
Edits: 07/01/09
"Seems as if you could achieve a -2.4V (two 1.2V cells in series) bias with an internal resistance of less than 14 milliohms."Maybe...
That 7 milli-ohm figure is a marketing number for electric vehicle
batteries. The other figure given in that chart (650 milli-ohms) is
very close to what I actually measure on 2 new AA NiMH batterise in
series in a battery bias circuit (1 ohm total). If you use these in
the cathode branch with 20 mA or so through them you will stabilize
at 2.8-2.9 volts in circuit.These are all measured numbers
Edits: 07/02/09 07/02/09
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