Building a 4-level Data Slicer

[zonian149]

This may be a stupid question, but I will ask it anyway. I am a novice when it comes to building electronic circuits, but I was wondering if it is possible to build any of the Data Slicers using a Breadboard. It seems like a relatively easy project looking at the parts lists and schematics which I can read somewhat. I have lots of time on my hands so I was wanting something to do. I currently own a 4 level data slicer which I think has stopped working. I also own a 2-level data slicer which works fine. It may not be possible, but there is not way for me to know without asking. Thanks in advance.--Gary

[Discriminator]

I was wondering if it is possible to build any of the Data Slicers using a Breadboard

The 4 level slicer can be built  perfectly using a breadboard. Actually, that's how I built the first few prototypes before going to PCB.

Please be advised that a professionally manufactured bare circuit board for the 4 level interface is also available.

[zonian149]

Thanks for the reply. I will start collecting the parts and give it a go.

[zonian149]

Mr. Discriminator,
I have a couple follow up questions. I have soebt many hours of looking for equivalent parts here in the United States to construct the 4-level data slicer on a breadboard. I think I have found all the parts except 1 (STMicroelectronics BAT43 Schottky Diode 30V 0.1A DO 35). The only one I can find is .2A, so the questions is will the .2A work? My other questions is there anything I could check on my existing 4-level data slice to find out why it has quit working. I have checked the power supply and it is putting out the correct voltage. Thanks--Gary

[Discriminator]

I think I have found all the parts except 1 (STMicroelectronics BAT43 Schottky Diode 30V 0.1A DO 35). The only one I can find is .2A, so the questions is will the .2A work?

Any BAT42 or BAT43 will do. Abbreviated data sometimes show different values, but it's the type number and datasheet that counts.

My other questions is there anything I could check on my existing 4-level data slice to find out why it has quit working. I have checked the power supply and it is putting out the correct voltage.

Some points to check:

- Output of the 78L08, should be around 8V
- Voltage on pin 4 of the TL074 should be around 8V
- Voltage on pin 11 of the TL074 should be around -7.5 to -8V
- With a signal present, the voltage on the D2/R4 junction should be around 2V, while on the D3/R5 junction, it should be around -2V. These voltages are adjusted with the potentiometer on the board

Hope this helps.

-Rene