|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
24.22.235.48
In Reply to: RE: Help with diode biasing. posted by twystd on September 11, 2014 at 14:38:51
The 1.8v forward voltage spec is the maximum at 1 amp current (typical is 1.6v).
The plot of forward voltage against current is unreadable at 20mA, other that to say it's "less than 0.8v".
If you look carefully at those curves, you will see that they are essentially straight above about 200mA, meaning the forward voltage drop at these currents is dominated by resistance, not by the semiconductor behavior.
Follow Ups:
Since the tube is running a lot less than 1 amp, the voltage drop across the diodes is less too.
If you had measured the voltage drop across the 10 ohm resistor, you would have sorted that out right away!
Below 200 mA, "semiconductor behavior" means that the voltage increases as the logarithm of the (forward-bias) current.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: