Analogue-sequencer

On Tue, 30 Mar 2004, Andy Wilson wrote:

> What you need to do is connect the meter probes to the common and the
> V/Ohm/mA input and set the meter to measure *voltage* not current.
> Now apply voltage to the dc input jack of the P3 and measure the
> voltage between the 2 input pins. It should measure about 9V. If

did that... 7.6v. even after i've removed the fuse, replaced it with a
wire link, and removed D1, the regulator gets very hot and the P3 does not
appear to power up. looking at the data sheet, the regulator's ground is
the middle pin. from that to the third pin (output), the voltage registers
as .776v.

my theory is that while i was attempting to work with the P3 while
shorting the fuse through my multimeter, i toasted the power supply
somehow. the voltage has dropped, and now it's outputting SIX amps. my
other theory is that this has happend AND i've toasted the voltage
regulator in the process. the rest of the chips feel fine. no magic smoke,
no heat.

> Now measure the output pin 3 of the voltage regulator 7805 (you can
> measure this at the striped end of D1 if you have used it). This
> should be +5V. If this all checks out, then chances are the power
> supply is OK.....but......

from pin 1 (input) to pin 3 (output), the voltage it's outputting is 5.6.

thanks for your help andy,
fred.

bleep.
out.

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