Help with a homemade test set

[rsnella]

I have an old home made "test system" that was made by my father, a
test set designer for Western Electric PBX, in about 1969. It was
given to me for Christmas and was called a "Computer". I now have
a 5 year old son and he wants me to get this working again.

The first problem I am having is that I was a real boy and took it
apart and lost some of the wires, and broke off some of the connections

when I was young.


The second problem is that my father pasted away 3 years ago and we did

not fix it before he got sick.


The third is that I have not worked on circuits for far to many years.


What this did was when the dial was turned it would light one of 10
lights across the top.


The test system has a 45 volt battery a western electric dial and a
circuit board. The circuit board has 10 identical components. It
looks like a resistor, to a transistor from there to a capacitor then
to a diode and then to another capacitor. The first lights ground is
hooked to all the other lights and to the dial on the Y terminal then
the other side of the light is connected to the circuit. The BK
terminal looks to go to the start of the circuit board. The BB
terminal looks like there was a wire there, but none are connected. I
can not find where the power should be connected, or where the ground
should be connected.


Please help me, my Son is driving me nuts and I can not believe I broke

this and never asked for help to fix it.

 

[John Fields]

I have an old home made "test system" that was made by my father, a
test set designer for Western Electric PBX, in about 1969. It was
given to me for Christmas and was called a "Computer". I now have
a 5 year old son and he wants me to get this working again.

The first problem I am having is that I was a real boy and took it
apart and lost some of the wires, and broke off some of the connections

when I was young.


The second problem is that my father pasted away 3 years ago and we did

not fix it before he got sick.


The third is that I have not worked on circuits for far to many years.


What this did was when the dial was turned it would light one of 10
lights across the top.


The test system has a 45 volt battery a western electric dial and a
circuit board. The circuit board has 10 identical components. It
looks like a resistor, to a transistor from there to a capacitor then
to a diode and then to another capacitor. The first lights ground is
hooked to all the other lights and to the dial on the Y terminal then
the other side of the light is connected to the circuit. The BK
terminal looks to go to the start of the circuit board. The BB
terminal looks like there was a wire there, but none are connected. I
can not find where the power should be connected, or where the ground
should be connected.


Please help me, my Son is driving me nuts and I can not believe I broke

this and never asked for help to fix it.

 

[rsnella]

I will try to do so latter today.

 

[Dave Farrance]

Can you post a schematic of what you have to alt.binaries
schematics.electronic?

That's a new one to me. Probably carried by a minority of news servers.
Putting a schematic on a website and posting a link here works.

 

[John Fields]

That's a new one to me. Probably carried by a minority of news servers.

 

[rsnella]

OK I have tried to make the schematic the best I could. I have posted
it at http://www.vankampencommunications.com it is under Test Set
Project.

I also included 3 photos of the project.

Thank you for any help.

Russ

 

[Dave Farrance]

OK I have tried to make the schematic the best I could. I have posted
it at http://www.vankampencommunications.com it is under Test Set
Project.

I also included 3 photos of the project.

Ahem. Check your HTML. You've misspelled the links.

 

[[email protected]]

OK I have tried to make the schematic the best I could. I have posted
it at http://www.vankampencommunications.com it is under Test Set
Project.

I also included 3 photos of the project.

Thank you for any help.

Russ

That should be "van" not "vam" in your URLs.

It appears that your problems are not too serious. The circuit is a
ten-stage "flip-flop" where the trigger signal goes into the network of
capacitors annd diodes that meet at the resistor near the bottom of the
page. Connect one terminal of the dial to that resistor. The other
terminal of the dial goes to the (-) side of the power supply, and so
does the broken return connection from all the lamps.

 

[rsnella]

The urls have been fixed. Sorry to late of a night.

 

[Don Bowey]

OK I have tried to make the schematic the best I could. I have posted
it at http://www.vankampencommunications.com it is under Test Set
Project.

I also included 3 photos of the project.

Thank you for any help.

Russ

This is only an educated guess, but I believe it is a prototype of a test
set for testing pulsing operation of an external relay.

Don

 

[YD]

OK I have tried to make the schematic the best I could. I have posted
it at http://www.vankampencommunications.com it is under Test Set
Project.

I also included 3 photos of the project.

Thank you for any help.

Russ

I vaguely recall having seen something similar in some magazine in the
70s. Basically a ring counter based on programmable unijunction
transistors (PUTs). I'll see if I still have anything about it in the
attic, don't hold your breath. In the meanwhile, try to find a type
number, google on that, PUTs and ring counters.

- YD.