Archive of the former Yahoo!Groups mailing list: MOTM

Just got some photos back with the Jpegs. I am sending the low res, but
have hi res for anyone interested. These 4 images tell the tale of laying
out a circuit on MOTM proto board.

Image 19 shows the first step (after all the paperwork) installing all the
uninsulated jumpers.

Image 20 shows the organic solder parts installed.

Image 22 adds the pots trimmers and insulated jumpers

Image 24 adds all the wiring for off-board pots jacks and LEDs.

The circuit is an adaptation of the Blacet mixer. However, instead of a 3
into 1 and 1 into 1, this is a 4 into 1 or 2 into 2. It automatically
switches from 4X1 to 2X2 when the # 2 output jack is inserted. For you LED
lovers, there are 6. Each output has LEDs to show the phase of the output
(borrowed that from Blacet) so you can see any DC offset. And off board
pots provide DC offset adjustment. Inputs are of course, reversing. The
remaining two LEDs (totally unnecessary) show the mode 4X1 or 2X2. Good
ICs for the mixer,TL054s. Cheap stuff, LM324 and 2N2222s to drive the
LEDs.

Anyhow, I learned a lot laying out a circuit on a proto board:

1 - I realize how much about construction I have learned from Paul and
continue use. THANKS PAUL
2 - Paul makes a very nice (but expensive) proto board.
3 - 80% of the work is the layout on paper before you start.
4 - It takes a long time to stuff the 125 uninsulated jumpers to make the
circuit connections.
5 - proto-board work is VERY rewarding and satisfying.

I started this project because I have one Blacet mixer. I threw away
(actually sold to another stooge) most of the expensive parts (pots, panel,
jacks, knobs and such) so I could build it to MOTM mechanical spec. That
was the day I decided that it was not worth buying another Blacet mixer.
The circuit board and on-board parts are all I saved from the original kit.
So, I decided to make the modifications I would like to see in that basic
plan and start from scratch with a MOTM circuit board.

This is the first of several circuits that I will be doing on MOTM proto
board. They are not built as proto-types but as keepers. So, I have
avoided all the easy short cuts like resistors on end and such. Any of my
layouts specifically designed for MOTM protoboards are available to list
members for the asking.

Larry Hendry

Disclaimer: I am not a design engineer. I am using known to work circuits
and changing them for my own enjoyment and learning. I am not sharing this
because I have anything to sell. However, I would encourage you all that
build kits to buy a MOTM proto board from Paul and do something with it.
It will be fun.