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Motorola HSN1000A [message #1034] Tue, 11 October 2011 15:35
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How to modify a Motorola HSN1000A amplified speaker for use with other radios, scanners, etc. Obtain a Molex # 0003061061 or 0003061062 female connector. Looking at the end of the female connector with the beveled corners to the left and the two triangular notches to the right, the pins are as follow:

upper left: audio ground

upper right: audio in

middle left: +13.8 volts

middle right: power ground & external speaker ground

lower left: external speaker out

lower right: internal speaker in

Connect a 1/8' (3.5mm) mono mini phone plug across the primary winding of an audio transformer. Connect the secondary winding of the audio transformer across the audio in and audio ground pins on the Molex connector.

Plug the mono mini phone plug into the headphone jack of your audio source. Connect power across the +13.8 volt and power ground pins on the Molex connector. Also connect the power ground pin on the Molex connector to the sleeve connection of a 1/8' (3.5mm) mono mini phone jack. Connect the external speaker out pin on the Molex connector to the tip connection of the mono mini phone jack. Connect the internal speaker in pin on the Molex connector to the normally closed connection on the mono mini phone jack. Plug an external speaker into the mono mini phone jack if you wish to use one or leave the mono mini phone jack unplugged to use the speaker inside the Motorola HSN1000A.

If you always want to use the internal speaker of the Motorola HSN1000A, you can simply jumper the external speaker out pin to the internal speaker in pin and leave off the mono mini phone jack. If you want to use the HSN1000A with a handheld radio having its own power source (e.g., batteries) isolated from the power source for the HSN1000A, then the audio transformer is optional. Ideally, the audio transformer would have 8:8 ohm winding impedance, but I used a 600:600 ohm transformer that can easily be scavenged from an old telephone modem or bought at Radio Shack, if they still carry item # 273-1374.

If you want to connect the HSN1000A to an audio source with a stereo output, simply use a 1/8" (3.5mm) stereo mini phone plug instead of a mono mini phone plug and connect only the tip and sleeve connections, leaving the ring connection unconnected.
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