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November 13, 2025, 10:15:55 PM

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Realistic MPA-100

Started by saturated, October 26, 2025, 09:49:38 PM

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g1

The cap has the 4 as a multiplier, not as a digit.  So 33 with 4 zeroes, in pF.
For the transistor sub, power and current & Hfe look ok but I don't think the Vceo of the TTC015B is sufficient.  I would look for the TTC004B.

saturated

Yes sir thanks also I think I learned 1H means 50 v DC  xP
I ask stupid questions
and make stupid mistakes

criticism, critique, derision, flaming, verbal abuse welcome

saturated

Ok
Got my transistors in yesterday so today didn't have a lot of time but hey onward we go

Anyhow wife gave me too much coffee so I had some hella jitters trying to get this in

Also I verified pinout etc

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And the ugly truth

Oh yeah that nut that was glued to the board and fell off added to the entertainment

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I did not have tons of confidence in this install so I checked for continuity but fingers crossed apparently no solder bridges

So now just waiting on my capaci-TATERS  :'(  :'(

I ask stupid questions
and make stupid mistakes

criticism, critique, derision, flaming, verbal abuse welcome

saturated

#18
Too much fun

Just had a cow looking at the collector which appears to be touching the heatsink  :grr

Anyhow I did some more continuity tests and I think it's ok but yeah gonna have to pay attention to stuff like that

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EDIT:  note to self.  Next time you need to bend the legs 90 degrees approximate the horizontal distance needed then find a nice firm sharp 90 degree edge to use as a die
Because it also messes up trying to solder when legs are coming through the hole at an angle SMH

EDIT 2: Maybe instead of nice sharp 90 degree edge I should have said nice CRISP edge.  Like when I used to be in Alberta and when I got cold ❄️🥶 the locals would say "She's getting CRISP" 
I ask stupid questions
and make stupid mistakes

criticism, critique, derision, flaming, verbal abuse welcome

Jazz P Bass

That 'heatsink' looks to me to be a ceramic pad (for heatsinking purposes).
It should be nonconductive.