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 Headphones in Ext Spkr socket

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Tonyvic
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Tonyvic


Call Sign : 26-CT-4013/M7DVQ
Posts : 134
Times Thanked : 4
Join date : 2021-02-24
QTH or Location : Brighton, East Sussex
Equipment Used : Yaesu 450at - Half Wave Silver Rod - CRT Space-U with unknown antenna.
Age : 75

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PostSubject: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeTue Mar 02, 2021 3:29 pm

Does anyone know if it's safe to use stereo headohones with a ss6900N radio, I don't want to risk blowing the audio output stage.
I am trying to save some cash and keep 'er indoors sweet, as I will need to pay someone to erect my antena which could cause her to go into Evil or Very Mad  mode. lol!
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Victor
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Victor


Call Sign : 26-CT-3228 / M7VIC
Posts : 4205
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Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeTue Mar 02, 2021 4:23 pm

You should be fine with standard headphones plugged into your rig.👍

You'll find the 'ext speaker' socket is usually a 'mono' affair so will only hear from one side of stereo headphones, so if they have a switch for 'mono' you're good or otherwise you'll need a 'mono to stereo' adapter. (That or 'mono' headphones or stick a mono jack on the headphone lead.)

It was more of a historic thing with old high impedance headphones and low impedance speaker outputs but never really an issue except with high power.

Most Headphone output sockets have a resistive dropper so you don't blow your eardrums out on full volume!  Shocked
Keep the volume down and all should be well.

Just don't try it on some multi-watt audio amp speaker output.... you'll blow the headphones! 


BTW, this is guidance only....if you blow up your "Dr Dre's" or your rig then don't go suing my ass, it'd be pointless as I'm broke! Very Happy


73
Victor

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Victor
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PostSubject: Re: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeTue Mar 02, 2021 4:24 pm

Ah, you already posted Martin.....I was 'multi-tasking' so didn't click 'post' fast enough Very Happy
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Tonyvic
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Tonyvic


Call Sign : 26-CT-4013/M7DVQ
Posts : 134
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Join date : 2021-02-24
QTH or Location : Brighton, East Sussex
Equipment Used : Yaesu 450at - Half Wave Silver Rod - CRT Space-U with unknown antenna.
Age : 75

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PostSubject: Re: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeTue Mar 02, 2021 7:21 pm

Thanks both, I will get the adaptor.

Victor wrote:
BTW, this is guidance only....if you blow up your "Dr Dre's" or your rig then don't go suing my ass, it'd be pointless as I'm broke!
It wouldn't just be your ass! lol!
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Mitch
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Call Sign : M1TCH
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Join date : 2020-01-02
QTH or Location : Leicester
Equipment Used : Yaesu FT-857D, Diamond V2000, Major 3000, President Jackson Mk1, Lafayette AFS-1005, K40 mic, KL203, B550P and Sirio GPE 27 ⅝λ.

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PostSubject: Re: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeTue Mar 02, 2021 7:28 pm

Plugging headphones into a speaker out socket is likely to be too loud, at least that's what I found, the receiver hiss is also too loud even on low volume. I made myself an adapter for headphones to use in speaker sockets, a mono 3.5mm plug to a stereo 3.5mm socket with an 82 ohm resistor in series and both 'live' sides connected together and earth side to plug earth. If you want to sacrifice a pair of headphones just for the job (buy cheap ones), cut off the stereo plug and fit a mono one, connect both earths together, then don't use the earth connection and have one 'live' to the end pin and the other 'live' to earth so it'll come out of both sides, I'd also fit a series resistor (47 to 100 ohms) to drop the volume so you're not deafened by accident. It works very well for me and was worth the effort, plus the other half is happy as well. You're unlikely to damage the radio btw.

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SangueG
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Call Sign : 26-CT-3971 / M7TDV
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Equipment Used : Little radios, home-made antennas

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PostSubject: Re: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeTue Mar 02, 2021 9:27 pm

Hi Tony. I found the below link just the other day which has a similar design of adapter to that which the last poster details that someone has made for this radio. Site not in English but translates fine through Google..

https://sites.google.com/view/mjsilva08/comunica%C3%A7%C3%B5es-r%C3%A1dio/esta%C3%A7%C3%A3o/crt-6900n

I notice they have done a cheap 12V PSU trick similar to me too  Smile

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Tonyvic
Senior contributor
Senior contributor
Tonyvic


Call Sign : 26-CT-4013/M7DVQ
Posts : 134
Times Thanked : 4
Join date : 2021-02-24
QTH or Location : Brighton, East Sussex
Equipment Used : Yaesu 450at - Half Wave Silver Rod - CRT Space-U with unknown antenna.
Age : 75

Headphones in Ext Spkr socket Empty
PostSubject: Re: Headphones in Ext Spkr socket   Headphones in Ext Spkr socket Icon_minitimeWed Mar 03, 2021 11:39 am

Thanks for the other suggestions guys, if the adaptor is a 'no go' I will look into them.
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