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ARRL data ransom payout, from the view of the average CBer LMAO

darlington upgrade is vindicated: on the home stretch of a 25gtl buildout, (paint, LEDs, the whole 9) and the audio transformer gave up the ghost and was dumping power through it. darlington got wicked hot. if it was a TIP120 that wouldve cooked instantly. if it works when i partspig a new...

how does that look on scope with the resistor across it?

see pinned post on CB modifications forum.

regulator/sampling on cobra 29LTD deltatune pot is the DK control

went into a zachary T

Cobra 29 delta-tune repurpose: 2x 10k resistors needed to mimic center slot on the DT pot. R4 resistor to ground from pot 15k for something stupid-low like 25mW the center slot indent on the DT pot is a hair below 1w

that math is above my pay grade lol

so how many percent modulation is it when the dead key is about 25 milliwatts and the p.e.p. is 25 watts? thats how much modulation this radio is capable of cleanly delivering with the repurposed deltatunepot at the lowest setting

ok i can confirm this works with mosfets. i have mine biasing on. and i had to mess with the resistor on the low end of the pot to get the deltatune pot to put out a carrier at all with it turned all the way down. ended up with 15k with a dk of 20ish milliwatts at the lowest setting of the...

yea, mosfets generally draw more, esp with a bias. don't give this info to anyone who's gonna dry the supply up this time lol. i have lots of old 23ch rigs i want to do this to so i can bask in fake wood grain and incandescent glow

142* but yea the original used a TIP120 which i don't really trust with a hot final

note the darlington needs to be heatsinked. the tip142 is to-247 style. heavy duty

corrected the schematic too.

quite honestly, this thread should be pinned. the less people snip limiters and do a 2w resistor and cap, the better for the noise levels when that skip opens up. the thing is, even if you just crank the limiter open for happy watts and get a little pinching in it, it's still way less than any...

you should definetly try it. this is gonna be my go-to from here on out instead of the npc/rc things with the tip120 in the driver's path. so much better

i did 12 years or so ago. that rig screamed. 2 swingin 80 all day

IT WORKS FLAWLESSLY 1st prototype using the TIP142 has me swinging wicked clean on a president zachary T. we're talkin .4w swingin 15PEP. i'm happy. so there you have it. 2.2uf delay, TIP142 for a bigger regulator, and i believe this things ready for bigger-final rigs

1st proto with fat darlington TIP142 which is a to-247 package with a little more surface area to sink off.