George:
I don't understand the purpose of the bridge rectifier. If you have 2x12 Volt DC power supplies in series, and the two 2200/50 for more filtration, that should be all you need, like two "D" cells in series in a flashlight, then plus to plus, minus to minus on the radio. Expect the 35 Volts to drop considerably when load is added. I'd replace that "standard 120 Volt AC plug" with some oddball thing before there is a disastrous accident with 120 Volts AC. Murphy never sleeps.
Lewis
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Some power supplies have a small adjustment screw and can be set higher.
Agree with Lewis, remove the plug. Many 32 volt radios use #48 output tubes. They both will burn out if plugged into 120 volts. May be one reason why these tubes are usually found with open filaments.
Norm
::Hi All, Was wondering before I make my connections to the Airline radio with the Power Supply. On this farm radio it had a plug that looks like a standard 120VAC plug. I'm using a 2 x 12 VDC = 24 VDC PS going to a bridge rectifier then to 2 - 2200 mfd 50 Volt Electrolytics, I'm getting 35 VDC out of it between the two legs. My question is I hook the + side to the radios + side hook up and then the - side to the radios - side, is that the proper way to hook up the PS assembly? Thank You, George T.
:
:George:
:I don't understand the purpose of the bridge rectifier. If you have 2x12 Volt DC power supplies in series, and the two 2200/50 for more filtration, that should be all you need, like two "D" cells in series in a flashlight, then plus to plus, minus to minus on the radio. Expect the 35 Volts to drop considerably when load is added. I'd replace that "standard 120 Volt AC plug" with some oddball thing before there is a disastrous accident with 120 Volts AC. Murphy never sleeps.
:Lewis
::
:
:
Or would I put the 2 - 12 volt wires from the transformer together and use the center tap as the negative. This is my first oddball 32 volt radio I've had to work on and I'm a little unsure of the hook up of the transformer. Thanks George T
:Hi George
:
: Some power supplies have a small adjustment screw and can be set higher.
:
: Agree with Lewis, remove the plug. Many 32 volt radios use #48 output tubes. They both will burn out if plugged into 120 volts. May be one reason why these tubes are usually found with open filaments.
:
:Norm
:
:
:::Hi All, Was wondering before I make my connections to the Airline radio with the Power Supply. On this farm radio it had a plug that looks like a standard 120VAC plug. I'm using a 2 x 12 VDC = 24 VDC PS going to a bridge rectifier then to 2 - 2200 mfd 50 Volt Electrolytics, I'm getting 35 VDC out of it between the two legs. My question is I hook the + side to the radios + side hook up and then the - side to the radios - side, is that the proper way to hook up the PS assembly? Thank You, George T.
::
::George:
::I don't understand the purpose of the bridge rectifier. If you have 2x12 Volt DC power supplies in series, and the two 2200/50 for more filtration, that should be all you need, like two "D" cells in series in a flashlight, then plus to plus, minus to minus on the radio. Expect the 35 Volts to drop considerably when load is added. I'd replace that "standard 120 Volt AC plug" with some oddball thing before there is a disastrous accident with 120 Volts AC. Murphy never sleeps.
::Lewis
:::
::
::
:
:
:Hi All, I did remove the DC plug from the radio. It had a ribbed side on the cord that was for positive and had to be plugged in to the outlet accordingly and the other side of the plug was negative just like a polarized plug of today. Well all of that is gone and I just have the hookup points in the chassis now. I'm just wondering if I'm correct with the hook up of the power supply. With the bridge rectifier there is a plus side and a negative side that will be going to the electrolytics and then to the radios hookup points. I figure the plus side of the feed goes to were the ribbed cord went and the negative side goes to were the negative side of the original cord was hooked up.
:
:Or would I put the 2 - 12 volt wires from the transformer together and use the center tap as the negative. This is my first oddball 32 volt radio I've had to work on and I'm a little unsure of the hook up of the transformer. Thanks George T
:
:
:
:
::Hi George
::
:: Some power supplies have a small adjustment screw and can be set higher.
::
:: Agree with Lewis, remove the plug. Many 32 volt radios use #48 output tubes. They both will burn out if plugged into 120 volts. May be one reason why these tubes are usually found with open filaments.
::
::Norm
::
::
::::Hi All, Was wondering before I make my connections to the Airline radio with the Power Supply. On this farm radio it had a plug that looks like a standard 120VAC plug. I'm using a 2 x 12 VDC = 24 VDC PS going to a bridge rectifier then to 2 - 2200 mfd 50 Volt Electrolytics, I'm getting 35 VDC out of it between the two legs. My question is I hook the + side to the radios + side hook up and then the - side to the radios - side, is that the proper way to hook up the PS assembly? Thank You, George T.
:::
:::George:
:::I don't understand the purpose of the bridge rectifier. If you have 2x12 Volt DC power supplies in series, and the two 2200/50 for more filtration, that should be all you need, like two "D" cells in series in a flashlight, then plus to plus, minus to minus on the radio. Expect the 35 Volts to drop considerably when load is added. I'd replace that "standard 120 Volt AC plug" with some oddball thing before there is a disastrous accident with 120 Volts AC. Murphy never sleeps.
:::Lewis
::::
:::
:::
::
::
:
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George:
Let's see if I have finally figgered out what you have done: You have one transformer with two 12 Volt center tapped windings. You are ignoring the center taps, and connecting the secondaries to provide around 24 Volts, which you are feeding into a bridge rectifier to produce DC, which you are filtering with two large capacitors and you are getting around 33 Volts out of the output. If the fog has lifted from my brain and I finally have it figgered out correctly, this sounds like an excellent way to power up your radio. The polarity must be such as to have the positive connected to the plates of the tubes. Now let's get it playing.
Lewis
::Hi to clear things up I made the power supply. I'm using a 120 volt transformer that converts 2 legs to 12 VDC with a unused center tap. I'm going to a bridge rectifier, one wire is hooked to one side and the other to the other side of it. Then there is a plus and minus side coming out of the bridge rectifier that goes to 2 - 2200 mfd electrolytics 50 volt working power. One side is plus and one side is negative. When I read across the 2 wires I get 35 VDC. I'm just wondering if the plus side will give me the 25 plus voltages needed to run the radio and the negative side will act as a neutral. Or does both of them work together to get the voltages needed to operate the radio when they are hooked up to there proper positions. Thanks Again, George T
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::
:
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:George:
:Let's see if I have finally figgered out what you have done: You have one transformer with two 12 Volt center tapped windings. You are ignoring the center taps, and connecting the secondaries to provide around 24 Volts, which you are feeding into a bridge rectifier to produce DC, which you are filtering with two large capacitors and you are getting around 33 Volts out of the output. If the fog has lifted from my brain and I finally have it figgered out correctly, this sounds like an excellent way to power up your radio. The polarity must be such as to have the positive connected to the plates of the tubes. Now let's get it playing.
:Lewis
: