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help needed, cave dewller does not work

Started by taquelim, January 08, 2015, 10:54:45 PM

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taquelim


i've built a cave dewller  using the etching layout, the pcb seems perfect but, i got no delay, just weak signal, i've made a few changes because i did not have the correct capacitors, changed the 1uf for a 1uf electolitic capacitor, and the 10uf tantalum for another electrolitic, everything else is ceramic capacitors and metal resistors.

with the probe i got signal in pins lpf1-in and out, lpf-2 in and out, but nothing more than this.
can someone help me please?

pin voltages
1-4.3
2-2.1
3-gnd
4-gnd
5-1.98
6-2.10
7-3.92
8-3.93
9-1
10-4.26
11-0.08
12-2.14
13-3.92
14-0.4
15-0.4
16-3.9

5v at 78l05 out pin witch is geting a bit hot
i've noticed that the layout is wrong at this ic, so i've put it wright, i believe....

madbean

If you are using the 78L05 you need to put it in just as shown on the layout. 7805 would require turning it 180 degrees. These voltages are way off so I'm guessing that is the problem.

taquelim

you are wright... i've change the position beacouse the 1st 78l05 i  put, burn right away, so i did check the datasheet.. guess i didn't read it wrigh