[Lowfer] Lowfer Final Transistors-Switching Time

[LEE BAHR]

I'm building up a Lyle Epson transmitter right now.  I first was going to do 
a pc board but got lazy and am going to use Manhatten Construction.  If it 
turns out good,  I'll maybe build another one with a PC board.  My final 
needed parts arrive tomorrow.  For now, it has an Epson osc x 10, divider 
chip, K1EL keyer chip with a 4 dip switch unit (will use only 3 positions to 
select the correct program).  I'll try Bill Ashlock's  final circuit with 4 
diodes and balanced drive pot plus drive control pot.  I'll have the final 
transistors in sockets to be able to try out different transistor 
configurations.  I'm going to put on a low pass filter but have it so I can 
bypass it if desired.  The board will contain a 5 volt regulator (7805... 
large) plus a LM317 adjustable regulator for the final voltage. I'm going to 
use a 7805 rather then a 78L05 because the input voltage may be too great 
for the small one if I am going to power it and the LM317 with about 24 
volts.  I'll make the LM317 adjustable.  I'm going to use 10 turn small 
board mounted pots in the project.  I'll enclose this whole thing in either 
an aluminum or plastic water proof box, so the board size will be determined 
by the enclosure.  Most likely, I''ll use a 6 inch square by 6 inch high 
plastic water tight electrical box from The Home Depot.

Lee, w0vt




"I'm builI need to get back to work on a lowfer tx based on Lyle's Epson osc 
and
2n2222/2n2907 design. Maybe with
a pc board more would try and put up part15 beacons. When I finish
Lowdown would be a good place to showcase that one. I have a
preliiminary layout in my PCB design program."