Post war 120volts to 12/24 power supply.

[chris vickery]

Jon, typically a rectifier changes AC current to DC current, and in this case with the CPP-2 it also steps it down from 120VAC to the required 12VDC or 24VDC as needed.
An inverter, on the other hand does just the opposite; DC voltage is changed to AC voltage. Think of using your car battery at 12VDC coupled up to say a 1000w 120VAC inverter to power things like laptops, dvd players etc in your vehicle.
Of course rectifiers or inverters are used in all kinds of applications for relatively low voltage, low amperage uses up to very high, very large industrial uses.
I have most recently worked on rectifiers (135MVA) IIRC in aluminum smelting. These take the supplied line voltage incoming (230,000VAC) and turn it into useable DC current for the potlines.
I believe the potlines main buss runs at 400,000+ Amperes.
Can you say giant bug zapper???

[Bob Carriere]

The design is very basics and massive ....... also very heavy...those side cut outs for handles do not provide a proper grip for lifting...... I am thinking of mounting one on a scaled down furniture dolly so I can wheel it under the work bench without scratching the hard wood floor. The second one will fit nicely on a shelf off the floor underneath the work station.

I got surplus static free electronic work bench some years ago when they shutdown a plant in Kanata....very heavy 1 inch plywood top covered with a 5/16 scuff proof plastic overlay which is grounded to the steel legs......steel panel legs and store shelf underneath. On top of the work bench is a secondary 16 inches high 12 inch back shelf with a full lenght power bar.

Nice tool to play with.

Bob C

[BCA]

My July 1953 Operator's Handbook says the CPP-2 (95 pounds) uses a power transformer followed by 2 metallic rectifiers and smoothing circuits (capacitor choke filter). This produces 2 separate 12 volt, 11 amp power supplies that may be connected by a switch in parallel to give 22 amps @ 12 volts or in series to give 11 amps @ 24 volts. The CCP-5 (129 pounds!) is similar in output but requires a 25 cycle input instead of 60 cycle input. 25 cycle was in common use before the introduction of 60 cycle (Mhtz) power in Canada. (? Late 1940's?).
They are a very useful bench power supply for 12 or 24 volts, although heavy to move around. ... Brian

[Bob Carriere]

...... I will stick to my CPP 2..... which I just carried down the basement to my workshop...... did not realize I was lugging 95 pounds.

Being lazy I have now one CPP 2 set up in the basement workshop and one set up in the sunroom were I do more clean work.....

I still have to set up a variac to slowly power up the 110 volt power supply for the 19 sets.....that I will do in the basement in case I blow up something.

On the Pawnshop TV show today they were powering up a WW II beach head amplifier/speaker set up..... the expert they had brought in had a canister type variac on the floor and was slowly dialing/powering up the old amplifier.... which ran well but had a loud 60 cycle hummmmm .....which he explained was caused by faulty condenser/filters which would need replacing.... and would be costly..... they estimated that the total value of individual parts...tubes.... transformers etc. were worht more than as a total amplifier unit.....

Strange were you can learn new information....

Brian are there any wiring diagrams in your operators manual???

Bob C



.......

[Doug Lavoie]

Bob,
Just saw a CPP-2 power supply on e bay for $249.00 or best offer.Thought that I would not see one like you have been talking about. To bad it is so far south east. The ebay # is: 141123542691.
Doug

[Bob Carriere]

Glad I got mine from MLU members..... at a better price and no shipping,

Bob C

[BCA]

Reasonably priced CPP-2 available for local pickup only: Milton, Ontario. PM me for details. ... Brian