I tried to build the L.D.D.V. yesterday, using a breadboard and
I came up with peculiar readings on the LEDs.
I had followed the
schematic from smartkit.
I thought that I had a false ICL7107 and I dismounted the
Today I thought to check the data sheets of ICL7107 and MAN6960 in order to cross-check the connections. Found inconsistencies
article schematic !
For example for the 1's display :
Article : ICL(6) -> MAN(10)
Should be : ICL(6) -> MAN(9)
another example :
Article : ICL(34)
Should be ICL(25) -> MAN(1) and so on... there are many there.
Moreover, the R1
should be 100K
, not 180K
, I refer to the datasheet
and the "Digital Voltmeter" project
Finally, the LCD dot, is pin number 5, emitted in the schematic.
I am about to search all the errors now and report back later,
after I will rebuild the voltmeter.
I attach the data sheets for further reference.