||Discrete Ladder Filter Question [SOLVED]
| br>I'm trying to figure out why my DLF is not functioning.
Part of the problem I'm having is due to a defective 100 Ohm trimpot in location PR2. Adjusting the trimmer caused no change in the pot. I have replaced this pot.
My question involves the U5 Voltage Regulator. The Builders Guide indicates on page 6 that a 7906 6 Volt Linear Regulator should be used.
I discovered that it is actually a 7806 which is the 6 volt regulator which is what I used in my build. After looking at the schematics it appears that (as far as I can tell) -6 volts is required.
Could I please get some clarification? Which regulator and what output is required;
7806 at 6 volts or 7906 at negative 6 volts br> br>
|Flareless wrote: |
|Which regulator and what output is required... |
You need a 7906. It is a -6V regulator.
Sorry for the confusion. I will alter the Builder's Guide to make this more clear.
Tony br> br>
| br>Thanks Tony. I should have checked first when I found the discrepancy.
I'll get the correct part and that will likely fix things up. br> br>
| br>Go figure... use the right parts and the module works!
Now that I have the DLF working I have to say that it's fast becoming my favourite filter. The sound it produces is just beautiful and I've only worked with it for a very short time after getting it all calibrated.
Because of the glitches I encountered it was a tough build. Desoldering, a process I'm sure everyone hates, caused a problem when a trace came off the board between PR2 and R19. Fortunately I was able to jumper the connection and clean up the trace without too much trouble.
Replacing U5 with the correct component, minus 6 volts rather than plus 6 volts, was a bit easier (thanks for correcting the documentation Tony)
I created a prototype silkscreen panel, however, I'm going to make a new one. First there is very slight blurring of the letters due so a minor exposure problem which I didn't notice until the panel was screened. The second issue is that CV2 should go from -10 to 10 rather than 0 to 10. Still, it looks pretty good for a prototype.
I have several filter and I have have to say that in the short time I've used the DLF I've really come to enjoy its features and sound.