HP amplifier, help!

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Grelinette
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HP amplifier, help!




by Grelinette » 17/04/20, 18:52

I change the subject a little ...

I got an old speaker that plugs into the sector and on which we can connect a music source to amplify it.

The input socket is old and I do not know the connections. (This is an old 5-pin Philips standard)

Do you think that this HP can allow me to amplify a source coming for example from my smartphone and thus amplify a music, or from my PC?
hp (1) .jpg
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hp (3) .jpg
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hp (2) .jpg
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Re: HP amplifier, help!




by phil59 » 17/04/20, 19:19

it looks like a 5 pin din, except that there is a "hole" in the middle ....

What does not scare is the V marked above ....

We manage to find din5 pins plugs to RCA, and then RCA to jack ...

Last edited by phil59 the 17 / 04 / 20, 19: 22, 1 edited once.
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Re: HP amplifier, help!




by Exnihiloest » 17/04/20, 19:21

Hello,

The "IN" input socket is a kind of 5-pin DIN socket. Their use is not standardized. I say "a kind" because in addition there is a central hole aligned with the 2 extreme holes of the series of 5, which does not exist in DIN.
So you have to try.
It is often the point in the center of the 5 which is the mass. With an ohmmeter we can verify that there is a short circuit between this point and the metal part of the socket, if not try another.
To locate the audio input, all you have to do is take a piece of bare electric wire, hold it in your hand, and insert it successively into the 5 inputs of the "IN" socket. If the amp is still good, you should hear a 50Hz hum and / or crackle when it's the right input.

I see that it is noted "pre-amplifier 1v". I think without certainty that this determines the most sensitive entry position, this is the one that should be used for a smartphone and which should be sufficient (maybe even too sensitive).
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Re: HP amplifier, help!




by Petrus » 17/04/20, 19:24

These are 5-pin DIN connectors, if you connect the inputs according to this table: http://www.hardwarebook.info/DIN_Audio with the selection button on "pre-amplifier 1V" it should not pose a PB, if you are satisfied with the music in mono.
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Re: HP amplifier, help!




by Evaluation » 18/04/20, 00:21

Grelinette wrote:Do you think that this HP can allow me to amplify a source coming for example from my smartphone and thus amplify a music, or from my PC?

No problem
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Re: HP amplifier, help!




by izentrop » 18/04/20, 00:41

Petrus wrote:These are 5-pin DIN connectors, if you connect the inputs according to this table: http://www.hardwarebook.info/DIN_Audio with the selection button on "pre-amplifier 1V" it should not pose a PB, if you are satisfied with the music in mono.
Yes in mono it is necessary to connect between
- 3 shielding of the audio cable
- 1 mono input

The loudspeaker membrane may be peeled off due to age
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Grelinette
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Re: HP amplifier, help!




by Grelinette » 18/04/20, 10:49

Thank you for all the info.
I am going to try a connection today, like that this evening at 20 pm, I will send music rather than tapping on pans to thank and encourage the health personnel!
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Re: HP amplifier, help!




by Exnihiloest » 18/04/20, 18:50

Petrus wrote:These are 5-pin DIN connectors, if you connect the inputs according to this table: http://www.hardwarebook.info/DIN_Audio with the selection button on "pre-amplifier 1V" it should not pose a PB, if you are satisfied with the music in mono.

It is an ersatz of the DIN. The central hole aligned with the 2 extreme holes does not exist in the DIN standard.
It does not mean that it is not compatible, it probably is, but better to test before final assembly.
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Re: HP amplifier, help!




by Grelinette » 20/04/20, 15:42

Well ... I removed the back plate of the HP to see the connections to the 5-pin DIN sockets and replace the IN socket (1 from the photo below).

A priori the hole in the middle of the socket does not correspond to a connection pin because there is no wire on the other side:

hp (5) .jpg
hp (5) .jpg (250.09 KB) Viewed 5251 times



By cons, I will not start changing the plug IN (1) by a simpler grip given the lack of space.

So I will either try to find a male DIN plug or make one, and only solder the necessary pins: A, B, C, D or F

According to you, among the contacts A, B, C, D, E, F, which are the 2 pins that I must connect?

hp (4) .jpg
hp (4) .jpg (183.37 KB) Viewed 5251 times


Last 3 small questions to finish abusing a little more of your time and experience:

1) If I make bad connections at the input (socket 1) from a source of output type smartphone earpiece, a priori there is no reason that I grill something in the HP? ....

2) What is the Channel button for (3)? (since there is only one entry: taken 1 :IN)

3) What is the selector for? 4
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Re: HP amplifier, help!




by Evaluation » 20/04/20, 16:19

Grelinette wrote:
By cons, I will not start changing the plug IN (1) by a simpler grip given the lack of space.

So I will either try to find a male DIN plug or make one, and only solder the necessary pins: A, B, C, D or F

According to you, among the contacts A, B, C, D, E, F, which are the 2 pins that I must connect?

hp (4) .jpg


Last 3 small questions to finish abusing a little more of your time and experience:

1) If I make bad connections at the input (socket 1) from a source of output type smartphone earpiece, a priori there is no reason that I grill something in the HP? ....

2) What is the Channel button for (3)? (since there is only one entry: taken 1 :IN)

3) What is the selector for? 4

It is a monophonic amplified speaker.
4 is used to select the sensitivity of the input.
1V should be fine, otherwise go to 7.5V if the sound saturates.

Chanel is used to choose which channel of the source to amplify, right or left.

mass in C,
right signal at E,
left signal at D

F is the shielding braid of a Din cable, also to ground.
It will work without connecting anything, since the mass will already be in C

The ideal would be to add right and left of the source with 2 resistors of approximately 1K and to connect the midpoint on E, to have right + left and not one or the other.
Principle below
Image

No risk of burning, the signals are weak but use input 1 of the speaker and not output 2.
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