On Wed, Feb 21, 2018 at 06:23 pm, LKNDAVE wrote:
i did the hokie pokie and this jpg came out
Based on this design I built this attached circuit.
It controls voltage nicely.? Really helps limit output power while working digital.
However the TIP 142 really generates some heat.? I have a heat sink on it but it will need to be much larger.? it is only drawing about .5 amp (1/2 amp) while transmitting.
Does that seem normal?? it the heat something I should be concerned about?? Or just provide a better heat sink and run it?
Thanks for the circuit idea and plan.
?
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73, W9KJO
Walter
