Re: 1802 oscillator problems
- Thanks for your help!
ough... on the board, I hard a short between pin 40=Vdd and pin
39=XTAL, whereas on the breadboard I connected the wire with pin
2=WAIT instead of pin 1=CLOCK...
A few hours of sleep may change the world :-)
- --- In email@example.com, Lee Hart <leeahart@...> wrote:
>assuming it's wired right and the resistor is indeed 10M (1*10^6)
> nils_eilers wrote:
> > My problem is: the oscillator doesn't run. I build according the
> > datasheet with 2 MHz Crystal, 10 M Ohm and 2 x 22pF.
> > Is this a known problem?
ohms the first place I'd go is a new crystal. remember it's a quartz
wafer in there and it will shatter like glass if dropped.
> Normally, the 1802 oscillator is no problem. Things to check:
> - what supply voltage? To run at 2 MHz you will need about 5v
> (not 3v for example).
> - is the crystal any good? will it oscillate with a regular 4069
> - is the 1802 good? You can test the internal inverter that makes
> the oscillator by just wiring the input high, and seeing if the
> output goes low, and vice versa.
> Ring the bells that still can ring
> Forget the perfect offering
> There is a crack in everything
> That's how the light gets in -- Leonard Cohen
> Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net