[Lowfer] Lowfer Final Transistors-Switching Time

[Paul Daulton]

Lee I put a ten turn 1k pot in the ground lead to the Epson chip. I can 
move the freq about 3 hz on 185khz(1853 fundamental). The epson chip is 
slightly voltage sensitive. Tip came from Mike we0h. I think a 
voltage/freq shift for the epson osc is some where on Lyle's site. 
Paul k5wms

Quoting LEE BAHR <pulsarxp at embarqmail.com>:
> 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."
>
>
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Paul Daulton K5WMS
beacon WMS 185.302 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu