Author Topic: S8550 PNP transistor  (Read 338 times)

jfrabat

S8550 PNP transistor
« on: May 26, 2020, 11:18:07 AM »
Hey, guys.

My Roomba robot (bought in 2006!) died during the pandemic, and I replaced it with a newer model.  But rather than throwing everything away, I decided to scavenge some parts off of it.  The main board, apart from a bunch electrolytic caps (most are 100uF, which I was short on!) and some diodes (1N5819 seems to be the majority; I have used 1N5817 the voltage side of pedals, but I figure this can work as well), has some of these S8550 transistors.  A quick look online says that these are "PNP transistor, designed for Class B push-pull audio amplifier and general purpose applications.", which I read as "please use in your guitar pedals." 

Have any of you got any experience with these transistors?  Are they useful?  Any particular circuit good suited to them?
« Last Edit: May 26, 2020, 11:50:28 AM by jfrabat »
I build.  I fix.  I fix again.  And again.  And yet again.  (sometimes again once more).  Then I have something that works! (Most of the time!).

jfrabat

Re: S8550 PNP transistor
« Reply #1 on: May 26, 2020, 11:34:57 AM »
By the way, it also has some B772 PNP transistors; are those good for anything useful?  How about S8050 NPN?  It has got some of those as well...
« Last Edit: May 26, 2020, 11:50:12 AM by jfrabat »
I build.  I fix.  I fix again.  And again.  And yet again.  (sometimes again once more).  Then I have something that works! (Most of the time!).

Peaved

Re: S8550 PNP transistor
« Reply #2 on: February 19, 2021, 12:23:00 AM »
Kinda late, but yeah I just used one of those guys in a pedal. I made a rangemaster-Fuzz face-tone circuit. I was having trouble with the Ge I was using in the rangemaster section. Had this sitting around, so I swapped it in. Sounds great, soldered it in.

iainpunk

Re: S8550 PNP transistor
« Reply #3 on: February 19, 2021, 09:50:46 AM »
i'd say you should just experiment with them, swap em in and out of fuzz circuits ''until it sticks'' when its the best transistor for the circuit.

cheers, Iain
half man - half snail - 6 feet to scale - Snail man's - not frail - He's been - to jail - snail man is fuccing real
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