peak detector capacitor oups - Electronic Circuits Projects Diagrams Free

MrDEB · 22nd June 2008, 12:50 PM

I am laying out the pc boards for the Tilt EQ unit I and a boy scout are building.
going with a one sided board but numerious jumpers for the ground (hope not a problem??
on the second board for the LM3916 display I am using the peak circuit from the data sheet BUT I find I ordered the wrong caps.
ordered 1uf ceramic not .1 ceramic caps.
this shouldn't be a problem??

**Nigel Goodwin** · 22nd June 2008, 02:00 PM

It will make the attack and decay times ten times longer.

MrDEB · 22nd June 2008, 09:40 PM

After posting the circuit I rechecked the data sheet and find the capacitor is supposed to be an electrolytic cap anyways.
make a run to radio shack on thursday.

crutschow · 23rd June 2008, 12:08 AM

Quote:

Originally Posted by MrDEB

After posting the circuit I rechecked the data sheet and find the capacitor is supposed to be an electrolytic cap anyways.
make a run to radio shack on thursday.

You can always use a ceramic cap in place of an electrolytic, generally with improved performance (even if you don't need it). The reasons to use electrolytics is that they are generally smaller and cheaper than ceramics, and come in much larger values.

audioguru · 23rd June 2008, 04:47 AM

A ceramic cap is microphonic and its vibration will be displayed on the LEDs. It should be a 0.1uF (100nF) metalized film capacitor. They are with a 5% tolerance.
A ceramic cap might have a 50% tolerance that also changes when its temperature changes.

It should not be a polarized type (as shown wrong on the datasheet).

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22nd June 2008, 02:00 PM	(permalink)
Nigel Goodwin	It will make the attack and decay times ten times longer. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

22nd June 2008, 09:40 PM	(permalink)
MrDEB	Another oups- After posting the circuit I rechecked the data sheet and find the capacitor is supposed to be an electrolytic cap anyways. make a run to radio shack on thursday.

23rd June 2008, 04:47 AM	(permalink)
audioguru	A ceramic cap is microphonic and its vibration will be displayed on the LEDs. It should be a 0.1uF (100nF) metalized film capacitor. They are with a 5% tolerance. A ceramic cap might have a 50% tolerance that also changes when its temperature changes. It should not be a polarized type (as shown wrong on the datasheet). __________________ Uncle $crooge