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 26, 2020, 03:05:54 AM

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jimilee

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

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

jubal81

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.
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jimilee

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