[Heathkit] HW-8 Audio Output

[Jeramy Thibodeaux]

This should work!

https://kc9on.com/product/hw-8-lm386-audio-board/

Several people on the heathkit groups.io reflector have endorsed this to 
fix the low impedance speaker issue.


73
JT
KG4AZT

On 4/21/25 5:53 PM, Mark K3MSB wrote:
> Thanks everyone;  I admit to being lazy Ken and I didn't look it up but I
> figured it couldn't be much.
>
> I'm repairing one for a friend and told him he could not use an 8 ohm
> headset, so I was looking for a matching transformer or line transformer.
> Lots out there to choose from.
>
> I think the Radio Shack 273-1380 should work.
>
> 73 Mark K3MSB
>
> On Mon, Apr 21, 2025 at 5:26 PM Ken Gordon <kgordon2006 at frontier.com> wrote:
>
>> On 21 Apr 2025 at 15:38, Mark K3MSB wrote:
>>
>>> Does anyone know what the output is rated in Watts?
>>>
>>> 73 Mark K3MSB
>> Well, Mark, according to the manual, the audio output transistor is an
>> MPS-A20.
>>
>> Specs say that maximum collector current is 100 mA at 4 VDC, which
>> works out to 0,4 watts.
>>
>> Does that sound about right to you?
>>
>> BTW, if you have not yet found a copy of "The Heathkit HW-8 Handbook 2
>> ed 2008 " in PDF format, you may find that book to be of interest.
>>
>> Ken W7EKB
>>
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