A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?

:A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?

Here's the way I would do it:
Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio. Et voila, there you are.
Lewis.

::A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?
:
:Here's the way I would do it:
: Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio. Et voila, there you are.
:Lewis. PS Here is more less of a schematic. Dunno how it will look when posted.

SPDT SW.
RADIO----------o\ VOLUME CONTROL
HI \o--------\/\/\/\/----GND
PHONO >------o | /
>----------------------|---/
LO |
|

to audio sectiom

:::A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?
::
::Here's the way I would do it:
:: Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio.

Sir John. . . . I saw this just sitting there previously, and wasn't sure WHUT that model # was. . .an AA-5 miniature tubed radio with an internal PCB used in its construction and also built as a clock radio. . .or. . .a Quasar TV. . .or. . . or some verrry old Motorola radio unit ? BUT. . . . before Sir Lewis also wires a telephone jack in, I'll additionally throw this illustration in below. Back in the VEWY first of my collegiate days , the small 45 rpm player had just came out and it was ALSO offered as a bare bones unit , with only the shielded lead of the cartridge output to a male RCA plug, so that an additional console would let people upgrade a console to accomodate the new record type. My CASH cow, was installing a phono input jack on smaller table radios in order to use its audio amp section and speaker(s). My Radio-Phono switching manner was merely to place a very minute burr on a rotor vane of the tuning condensers oscillator section when it was fully meshed. Run the tuning condenser to max meshed position at 550 and the radio was silenced. . . .BUT. . .usually, just a tuning off from receiving any station sufficed. . . .unless you were in one very "statticcy" environment !. . . arc welding etc. . . 7/7/2009 9:53:01 PMAnyone see a picture laying around. . . .?(75799:75754) :::A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch? :: ::Here's the way I would do it: :: Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio.
Sir John. . . . I saw this just sitting there previously, and wasn't sure WHUT that model # was. . .an AA-5 miniature tubed radio with an internal PCB used in its construction and also built as a clock radio. . .or. . .a Quasar TV. . .or. . . or some verrry old Motorola radio unit ? BUT. . . . before Sir Lewis also wires a telephone jack in, I'll additionally throw this illustration in below. Back in the VEWY first of my collegiate days , the small 45 rpm player had just came out and it was ALSO offered as a bare bones unit , with only the shielded lead of the cartridge output to a male RCA plug, so that an additional console would let people upgrade a console to accomodate the new record type. My CASH cow, was installing a phono input jack on smaller table radios in order to use its audio amp section and speaker(s). My Radio-Phono switching manner was merely to place a very minute burr on a rotor vane of the tuning condensers oscillator section when it was fully meshed. Run the tuning condenser to max meshed position at 550 and the radio was silenced. . . .BUT. . .usually, just a tuning off from receiving any station sufficed. . . .unless you were in one very "statticcy" environment !. . . arc welding etc. . . 73's de Edd

Phono Install Procedure for Radio. . . . .

::::A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?
:::
:::Here's the way I would do it:
::: Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio.
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:
:

: : : : : : : : : : : : : : :Sir John. . . . : : : : :I saw this just sitting there previously, and wasn't sure WHUT that model # was. . .an AA-5 miniature tubed radio with an internal PCB used in its construction and also built as a clock radio. . .or. . .a Quasar TV. . .or. . . or some verrry old Motorola radio unit ? : :BUT. . . . before Sir Lewis also wires a telephone jack in, I'll additionally throw this illustration in below. : : :Back in the VEWY first of my collegiate days , the small 45 rpm player had just came out and it was ALSO offered as a bare bones unit , with only the shielded lead of the cartridge output to a male RCA plug, so that an additional console would let people upgrade a console to accomodate the new record type. : : :My CASH cow, was installing a phono input jack on smaller table radios in order to use its audio amp section and speaker(s). : :My Radio-Phono switching manner was merely to place a very minute burr on a rotor vane of the tuning condensers oscillator section when it was fully meshed. Run the tuning condenser to max meshed position at 550 and the radio was silenced. . . .BUT. . .usually, just a tuning off from receiving any station sufficed. . . .unless you were in one very "statticcy" environment !. . . arc welding etc. . . : : : : : :73's de Edd : : : : : : :

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: : : :Phono Install Procedure for Radio. . . . . : : : ::

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Looks exactly like whut I described, Edd. I made a few bucks modifing radios for those little RCA 45 players myself.
Lewis
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Gentlemen,

Has it been determined if the radio is an AC operated radio or a transformerless radio. If transformerless, wouldn't it be a good idea to isolate the shield of the phono jack from chassis/B- for safety?

Radiodoc
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:::::A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?
::::
::::Here's the way I would do it:
:::: Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio.
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::

:: :: :: :: :: :: :: :: :: :: :: :: :: :: ::Sir John. . . . :: :: :: :: ::I saw this just sitting there previously, and wasn't sure WHUT that model # was. . .an AA-5 miniature tubed radio with an internal PCB used in its construction and also built as a clock radio. . .or. . .a Quasar TV. . .or. . . or some verrry old Motorola radio unit ? :: ::BUT. . . . before Sir Lewis also wires a telephone jack in, I'll additionally throw this illustration in below. :: :: ::Back in the VEWY first of my collegiate days , the small 45 rpm player had just came out and it was ALSO offered as a bare bones unit , with only the shielded lead of the cartridge output to a male RCA plug, so that an additional console would let people upgrade a console to accomodate the new record type. :: :: ::My CASH cow, was installing a phono input jack on smaller table radios in order to use its audio amp section and speaker(s). :: ::My Radio-Phono switching manner was merely to place a very minute burr on a rotor vane of the tuning condensers oscillator section when it was fully meshed. Run the tuning condenser to max meshed position at 550 and the radio was silenced. . . .BUT. . .usually, just a tuning off from receiving any station sufficed. . . .unless you were in one very "statticcy" environment !. . . arc welding etc. . . :: :: :: :: :: ::73's de Edd :: :: :: :: :: :: ::

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:: :: :: ::Phono Install Procedure for Radio. . . . . :: :: :: ::: ::

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:Looks exactly like whut I described, Edd. I made a few bucks modifing radios for those little RCA 45 players myself.
:Lewis
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Thanks for the ideas. I hooked up my jack as described and it works but the volume is not very loud even with the control turned all the way up. The radio plays much louder than the phono. Would there be some impedance mismatch and, if so, how could I solve that?

:Gentlemen,
:
:Has it been determined if the radio is an AC operated radio or a transformerless radio. If transformerless, wouldn't it be a good idea to isolate the shield of the phono jack from chassis/B- for safety?
:
:Radiodoc
:**************
:
:
::::::A friend asked me to install a phono jack in his Motorola model C16P. How would I do that? Do I have to use a switch?
:::::
:::::Here's the way I would do it:
::::: Get a SPDT switch, a phonop jack and some hook-up wire. Go to the hot side of the volume control, that is where the slider is when the volume is full on, and disconnect the wire there. Wire the common of the switch to the volume control terminal where you disconnected a wire. Connect (or replace with a new piece of wire) the wire you disconnected from the volume control to one side of the SPDT switch, and connect the remaining switch terminal to the phono jack. Coonnect the ground side of the jack to the low side of the volume control. Use the switch to connect to phono or radio.
:::
:::
:::

::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::Sir John. . . . ::: ::: ::: ::: :::I saw this just sitting there previously, and wasn't sure WHUT that model # was. . .an AA-5 miniature tubed radio with an internal PCB used in its construction and also built as a clock radio. . .or. . .a Quasar TV. . .or. . . or some verrry old Motorola radio unit ? ::: :::BUT. . . . before Sir Lewis also wires a telephone jack in, I'll additionally throw this illustration in below. ::: ::: :::Back in the VEWY first of my collegiate days , the small 45 rpm player had just came out and it was ALSO offered as a bare bones unit , with only the shielded lead of the cartridge output to a male RCA plug, so that an additional console would let people upgrade a console to accomodate the new record type. ::: ::: :::My CASH cow, was installing a phono input jack on smaller table radios in order to use its audio amp section and speaker(s). ::: :::My Radio-Phono switching manner was merely to place a very minute burr on a rotor vane of the tuning condensers oscillator section when it was fully meshed. Run the tuning condenser to max meshed position at 550 and the radio was silenced. . . .BUT. . .usually, just a tuning off from receiving any station sufficed. . . .unless you were in one very "statticcy" environment !. . . arc welding etc. . . ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: ::: ::: ::: :::

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::: ::: ::: :::Phono Install Procedure for Radio. . . . . ::: ::: ::: ::::: :::

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::Looks exactly like whut I described, Edd. I made a few bucks modifing radios for those little RCA 45 players myself.
::Lewis
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:::
:::

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: : : : : : : : : : : :Wel l l l l l . . .that is meaning that the phono cartridge that the player unit is using :does not have upwards of 1 Volt RMS output from it, thereby there is not enough :input level to fully drive those two stages of amplification in the radio up to a full wall shaking and speaker rattling output. ( Mostly rattling !). : : : :Do you have the option of another phono to sample its inputting. . .very likely not.. :into the radio. Or r r r . . .in just doing an exploratory test. . . .if you will just hook the :audio output from a CD or DVD player . . . with their prescribed 1V RMS outputs. . :into the system, should then establish a normalcy, and what you would be :expecting if using a phono cartridge with a high enough output level. : : : :And BTW What is that Motorola unit number? : :I was thinking of a fifties :vintage small clock radio with 5 mini tubes and is built on a PCB. : : : :The next question. . .is . .. would you be knowledgeable. . .aka solid state theory savvy. .. :in the design / use of a single transistor preamp stage for the input of the radio to bring that effective AF input signal level on up to where it needs to be. : :I can help if that is "Greek" to you .. .BUT. .fustest “I’se got’s to know whut’s that radio is !” : :So that I can then consult its schema for its design and then be able to see what is needed. : : : :Standing by. . . . after your loooooooooong haitus. . . . : : : : : : :73's de Edd : : : : :

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Yes Edd, somewhat Greek to me. The radio is a Motorola model C16P 25.

Thanks, John

john:

If you want to add an MP3 jack for an IPOD or such you can buy a stero jack from radio shack:
http://www.radioshack.com/product/index.jsp?productId=2103450&tab=summary

You will not need an extra switch if you use this.

It has 5 pins on it.

Pin 1 is sleeve ground.

2 and 3 are for "tip"
4 and 5 are for "ring"

Disconnect the radio signal from the high side of the vol control and connect via a shielded cable to pin 3. Ground the cable's shield.

Jumper pins 2 and 5 together to combine both stereo channels into monaural.

Then connect another shielded cable from either pin 2 or 5 back to the vol control high side... and ground the shield.

Ground Pin 1 to the b- or chassis.

You don't use pin 4.

With nothing plugged in the radio functions normally.

Now when you insert the Ipod plug Mp3 into the jack contacts for pins 2 and 3 will open and break the normal radio signal. Your new Mp3 input on pin 2 and 5 will combine to create a mono signal into the vol control.