Can't get blink circuit to work :(

[Acetronics2]

Alain,

Are you saying what I think you are saying about her?

"She" is actually an imaginary person then, isn't she?


_____________________

YESSSS, of course ...

All the women we're in love with are imaginary persons .... Thanks to god !!!

re- LOL

Alain

[Techbuilder]

It was a bad resonator and the current wasn't filtered enough

that was all

but works now

[Jasonce65]

Yea, when I use one of these chips in an industrial setting, I like to include a 220uf to 470uf at the regulator IC, which can sometimes be across the circuit board from the PIC, and then at least a 22uf or 47uf at the Vss and Vdd pins, followed by a low ESR cap like a poly-film or tantilum 0.1uf right next to each other at the PIC's IC socket.

If the same power supply is going to be used for a analog chip, like a recording/playback IC, for example, even with this much filtering, you'll realize how much noise there really is on the lines, especially if you are driving devices on the I/O pins, serail or data at high speeds. Just making a LED blink on and off will make the audio click, click, click...

Then I add like 2200uf or so onto the circuit. Remember that if you do this, to put an high speed, medium current diode in the circuit, reversed to absorb the "jolt" from accidentally shorting power supply line on the board, just as a good design. Shorting a high energy capacitor on a PC board can cause circulating currents that when coupled with the inductance of the length of the traces themselves, can cause pico-second sized high voltage pulses (oscillations) that can mysteriously kill and C-MOS IC. A 1 watt 5.1 volt zener can work pretty good too, plus it gives you a little added protection if the regulator goes wild. Any diode that's designed for switch mode power supply applications will do. If you keep the total capacitance in the circuit under 100uf or so, you don't have to worry about this, but I've found that being skimpy on filtering is a recepie for disaster.