So what's the problem with experimenting with new ideas and learning
something about microprocessors in the process. If I wanted plug and
play I would buy a no tune SS transceiver and amp. My HB amp driven by
my HT-32B has been through several iterations since I built it. About
the only thing left of the original design is the tube, input network,
and the power supply.
David
KW4DH
On 6/17/2012 3:56 PM, Roger (K8RI) wrote:
> On 6/17/2012 10:22 AM, Jim W7RY wrote:
>> -Has anyone tried an approach like Carel, PC5M, with a microprocessor
>> -controlled soft start for the filament. The microprocessor controls an
>> -optical triac driver The triac is turned on and off over an increasing
>> -portion of the line AC cycle until full on is reached. His
>> -microprocessor program does this in 100 sec. It is designed only for
>> -soft start and does not do any regulation of the filament voltage after
>> -full output is reached.
> You don't need a microprocessor to control the triac. Just an RC network
> plus a diac.
> They are noisy as all get out while ramping up and you only need about 4
> seconds for amateur HV supplies and even the Kalifornia KW QRO filaments.
>
>> -David
>> -KW4DH
>>
>> Oh PLEASE!
>>
>> Just put a resistor in line switched with a relay! This is not rocket
>> science!
> No contacts to clean, simple, and cheap! Emtron amps use the Triac to
> ramp up the voltage for the whole amp and it works very well.
>
> 73
>
> Roger (K8RI)
>
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