Vfe zener cap combination. I can’t see what’s going on there on both the Tractor Beam and Bumble Bee

Started by jimilee, April 25, 2020, 08:05:54 PM

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jimilee

April 25, 2020, 08:05:54 PM
Vfe zener cap combination. I can't see what's going on there on both the Tractor Beam and Bumble Bee. Is the cap just paralleled with the zener?


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Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

jimilee

#1
April 29, 2020, 01:11:36 PM
bump
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

jubal81

#2
April 29, 2020, 01:27:09 PM
It's a cheap voltage regulator. The combination is used to make reference and bias voltages for the JFETs. You wouldn't want to use a resistor divider there because the supply voltage can fluctuate with battery life or different DC supplies. The parallel cap it to reduce noise on the VREF.


Here's some info you want to read more about zoners as voltage regulators.
"If you put all the knobs on your amplifier on 10 you can get a much higher reaction-to-effort ratio with an electric guitar than you can with an acoustic."
- David Fair

jimilee

#3
April 29, 2020, 01:32:42 PM
thank you sir.
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.
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