DIYbanter - View Single Post - does it makes sense to use electrolytic can as bypass cap ?

robb

"Bill S." wrote in message
...
In article ,

says...
one is a electrolytic 1uF/50v polarized cap between 32v line
to
Vcc2 on chip and 0v ref

32v dc ---- 36 ohm --|-- 1uF/50v (polar) (-) ---|
|
Vcc2
0v ref

[trim]

there is a 36 Ohm 1/4 watt resistor ( orng blu blk gold )
between (inline with) the 32V supply volts to a Vcc2 pin on
an
IC, what is reason to use this setup and could it be another
mistake made by previous repairer ?

They may have wanted a bit of time delay for Vcc2 to come up
after Vcc1. Or just to decouple it from other circuits.
What kind of IC is it? Could be perfectly normal.

Thanks Bill for help,

it is a VFD display *driver* IC, 32 bit shift reg with latches.
VCC1 5-12 V to power the IC and the VCC2 is the controlled
voltage 0-60V ( 40 mA) which drives an the VFD display.

So i can replace the 36 ohm (it is fried) with anything close and
probably should choose one on the higher side (i.e. 47 Ohm over
the 22 Ohm) ?

thanks again for help,
robb