Search results

megawatt 37a switcher

so D17 which is a zener diode, im assuming 9.1v is removed, waiting on some to arrive in the mail, and a board trace between that lead and the diode/rest of the stuff cooked apart like a fuse. i am hoping that reconnecting that, changing the zener will bring everything back up. now we wait

doing a single pill MRF454 on a zach T and i think i just took a bunch of stuff out to trigger a relay, i tapped off of the JP13/D17 junction, and when messing around with the trigger circuit, i pulled that wire off on the other end. I let it go, and the end of the wire rubbed against an output...

class B, temp tracking fan. rattlecan paint job

i like their mrf 454s and i built a biased 4pill with the hg 2290s. but im not getting the finals again

ehh, im just gonna use FETs at this point. mitsubishi 1969s kick ass and are durable. HGs are a completely different animal. i'd see awesome numbers until :: pop:::

mosfets have proven to be more durable. all day. i've popped 5 1969 HGs so far trying them over the past couple years, theres a few radios out there in the wild that i worked on that also have them, hoping i won't have to see em again.

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...