Help required with recognising a DC power socket type

[Lawrence001]

I've bought an Arcaydis interface buffer and it works very nicely with my class D power amp but I'm thinking about upgrading the PSU. The thing is I don't know where to get a plug from it's a screw in type as shown here does anyone know what it's actually called?http://uploads.tapatalk-cdn.com/20170105/6cfe626200bb0ed79882ba55b53570be.jpg


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[Lawrence001]

They are not proprietary as this seems to use the same ones

http://pages.ebay.com/link/?nav=item.view&alt=web&id=271930160647


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[CornishPasty]

You can buy those from Maplin.

[Ian7633]

It looks like the same plug use for communications microphones

http://www.ebay.co.uk/itm/like/130802072550?lpid=122&chn=ps&adgroupid=42022636070&rlsatarget=pla-339941800557&adtype=pla&poi=&googleloc=1006692&device=c&campaignid=726760769&crdt=0

[Lawrence001]

Thanks the metal case looks the same but it seems to have 4 holes in the female whereas mine has 2


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[Lawrence001]

Here's another question related to using a buffer. If a passive pre has a higher impedance than the input impedance of the power amp, is there a risk the resistors will get hot or be overdriven ? Presumably one reason it is not a good match is that a lot of the energy is being wasted in the passive and not getting to the power amp?


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[Light Dependant Resistor]

The answer is they are a Marushin plug, and although not pictured match with a corresponding socket.
http://www.skt.cz/marushin/pdf/m-cn.pdf

Available in many variety of pin numbers, they are are useful connector, although not strictly a DC connector
but can be assigned for that purpose, as long as polarity is matched. A precaution is to use a diode either
in series anode In to Cathode out in the DC circuitry , or a diode in a shunt configuration, to protect
against incorrect polarity or circumstance where polarity is not obvious. Even my my soldering iron has one :)

[Light Dependant Resistor]

Here's another question related to using a buffer. If a passive pre has a higher impedance than the input impedance of the power amp, is there a risk the resistors will get hot or be overdriven ? Presumably one reason it is not a good match is that a lot of the energy is being wasted in the passive and not getting to the power amp?


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Most passive pre's are defined as an L Pad, although other Pad types are sometimes used, they are less common.
a properly designed L pad then has a series resistance and a shunt resistance. They are an attenuator.
Your assertion they are wasting power is somewhat false as- attenuators are needed pieces of circuitry.
You are seeing problems which are not there.

No, resistors will not get hot or be overdriven. A sensible designer allows for Ohms law and predicts current expended
which in the case of passive pre's is tiny, so very small wattage resistors in 99% of cases are quite OK to use.

With Light Dependent Resistors the mechanical wiping of one contact on another passing
audio signals is removed entirely, rather just light emission in an encapsulated space causes variance in resistance
hence are a far better and clever device for audio.

[struth]

They are used on back of Chinese psu s. As well mine has 2 of the 2 pin ones as dc outs

[Lawrence001]

Most passive pre's are defined as an L Pad, although other Pad types are sometimes used, they are less common.
a properly designed L pad then has a series resistance and a shunt resistance. They are an attenuator.
Your assertion they are wasting power is somewhat false as- attenuators are needed pieces of circuitry.
You are seeing problems which are not there.

No, resistors will not get hot or be overdriven. A sensible designer allows for Ohms law and predicts current expended
which in the case of passive pre's is tiny, so very small wattage resistors in 99% of cases are quite OK to use.

With Light Dependent Resistors the mechanical wiping of one contact on another passing
audio signals is removed entirely, rather just light emission in an encapsulated space causes variance in resistance
hence are a far better and clever device for audio.

Thanks for that in my case I'm using an original style tisbury passive pre which I didn't know has a shunt resistor. Hopefully I've got nothing to worry about anyway.



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[Qwin]

Yes 2 to 5, maybe 6 pin available, various companies make them, they are used as microphone plugs and on things like soldering stations. I used them between my external power supply and Technics TT (From Maplins)

One point to note, the fewer the pins in the connector, the larger diameter the pins/recepticals and therefore the larger their current carrying capacity, so check that the spec for the ones you intend using meets your amperage requirement. Two pin carry the most current so 2x2pin is better than 1x4pin for current capacity etc.

[CornishPasty]

Maplin code no. FK22Y.

[Lawrence001]

Thanks for all your help
I've now identified the socket, just one last question please.
If I buy a 12v power supply does it matter if it's over specified on power/current. Will my buffer just draw the power it needs and not be given too much power by a bigger PSU?


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[struth]

Nope, bigger is ok. As long as carrier voltage is right, the unit will only give whats asked of it

[Lawrence001]

Great looks like I'm sorted the best value decent 12v supply I have found is this unless anyone knows anything better for c. £20?

http://pages.ebay.com/link/?nav=item.view&alt=web&id=250734255819



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