Hello there,
I have quite a big problem. I am building a sound synthesizer using a 18F25=
50 as tri/sqr wave generator. Wrote the program, tested on breadboard, tran=
sfered to board, tested on board (with PICkit 2)... everything just PERFECT=
..

I also built a 12 to 9 to 5 V power supply by putting in series a 7809 then=
 a 7805, it works, the voltages are what they should be (9V is for the anal=
og part of the circuit), I can hear the square wave but not the triangular =
(from PWM output). PWM seems not to work. but if i touch to some random and=
 unconnected parts (i.e., the sixth pin in the programmer dock) I can hear,=
 at lower than expected frequency, another square wave, from the pwm output=
.. Then if i unplug the external supply and plug in the PICkit i have to tur=
n on then turn off then turn on and ONLY after that the pic start working p=
roperly again.

Unfortunately i don't have any measurement tool but a multimeter and a stei=
nberg sound card (as sound analyzer). The voltmeter dysplays 4.62V when wit=
h PICkit and 5.02V when power supply

Any suggestion? I already changed a couple of capacitors in the supply ciru=
it, but nothing changed. the circuit is:

                       ______           |->+9V       ______
12VDC --+------+------| 7809 |---+------+-----+-----| 7805 |---+------+----=
> +5V
        |      |      |______|   |      |      |    |______|   |      |
        =3D 100uF=3D 0.1uF    |      =3D 0.1uF=3D 100uF=3D0.1uF   |      =
=3D 0.1uF=3D 47uF
        | 40V  |          |      |      | 40V  |        |      |      | 10V
0V    --+------+----------+------+------+------+--------+------+------+----=
> GND
 		 	   		 =20
--=20
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