You also have to consider the power dissipation of the regulators. This
will vary with the heat sink if any o each of them.
You can connect diodes in series with the power input. The voltage drop
will e the junction voltage plus the the IR drop due to the current. You
can find out the total drop by measuring the current drain and going to
the spec sheet on the diode used. The spec sheets can be found by doing
a Google search on the part number of the diode used.
Roger K7RXV
Larry wrote:
What would happen if you connected the K1 up to say 16 vdc?
As far as I can tell it would work just fine.
I went through the schematics and found all of the components (I hope)
that use the unregulated input voltage and researched them on the net.
The results are:
Part Description Max Input Voltage
ZR78L06 6v regulator 20vdc
LM2930 8v regulator 26vdc
LM380 Audio Amp 22vdc
LT1252 Audio Amp 28vdc
I looks like the 6v regulator is the limiting component at 20vdc max input.
73
Larry
kb5dxy
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