[Boatanchors] Want to use stereo headphones w/mono audio output

[Phil]

Howie,
"Just shorting the tip and ring together on a 1/4" jack doesn't hack it."

Don't know why not, I've done it many, many times.  You can buy 1/4" adapters with a mono male plug and female stereo socket (both sides in parallel) that should do the trick for you.  I've made up short jumper cables in the past with a male mono plug on one end and female stereo socket on the other.  If you insist on adding resistors, something on the order of 10-47 Ohms in each leg should do the trick.

The above presumes that it's a Low-Z headphone jack on the receiver, if it's more, say 600 Ohms or a Hi-Z output then you'll need a matching transformer.  In that case an audio output Xformer from an old tube radio or similar should work OK.  As you're not needing a lot of power to drive the headset, power lost to impedance mismatch shouldn't hurt anything.

73 From "The Beaconeer's Lair"
Specializing in DXing NDBs (Longwave Beacons)
Phil, KO6BB,  http://www.qsl.net/ko6bb/
KO6BB/B beacon, ~20W on 28.290 MHz, Ringo Vertical

HF/LF RADIOS:
HOMEBREW:   7 Tube+Rect 1v3 Regen RX for LF (built 2015)
Icom:       IC-7200 Xceiver, DSP IF & filters (~2015).
Kenwood:    TS-450SAT Xceiver, cascaded 250/125Hz Inrad filters.
10M Beacon: 2 x Realistic HTX-100's on 28.290MHz
SDR:        Softrock Ensemble II LF (built from a kit 2017).

ACC:   HOMEBREW  LF-MF Pre-Amp, 8Hz Audio Filter.
        HOMEBREW  4 Port Antenna Multicoupler, Feeds 4 RX's.
        
ANTENNAS: 88 foot Long Ladder-line fed dipole, 35 feet AGL for MW/SW.
           Active Mini-Whip, 36 Feet AGL for LF/MW/SW.
           37 foot "Low Noise Vertical", 11 feet AGL for LF/MW/SW.
           Cushcraft AR-10 Ringo Vertical, 14 feet AGL for 10M beacon.
Merced, Central California, 37, 18, 37N   120, 30, 6W CM97rh

On 8/25/2017 3:05 AM, Howie WA3MCK wrote:
> I need a circuit for a simple resistive balancing network to connect stereo
> headphones for use with my monophonic boatanchor receiver.
>
> I remember seeing one in popular electronics back in the late 60's early
> 70's.
>
> Just shorting the tip and ring together on a 1/4" jack doesn't hack it.
>
> My old Telex 610 headphones are not that comfortable, frequency response
> sucks, and they  make my ears sweat and I go deaf temporarily when I take
> them off...
>
> Thank you
> Howie WA3MCK


---
This email has been checked for viruses by AVG.
http://www.avg.com