Nice work. I would make input BC546 flat face each other and thermally bond them with heatshrink tubing to give good thermal tracking.
Flip local heatsink near BC546 LTP to reduce heat effects.
That long left right loop of ground and speaker out is not good as it may induce current and is a long track for high current to go. Can speaker our be placed up high away from input stage transistors where noise pickup may be an issue?
one pair of 2sa1943/c5200 is good for approximately 60W into 4ohms, or 50W into 8ohms.
Hi sir Apex i found this amp on internet and i want to make it, so this pcb is good? What model of amplifier is? I can use 2sa1941 2sc5198 at +- 50V? Thanks and sorry for my english.
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that should be an Apex AX14 triple emitor follower, and if it is correct pcb it should sound �� really good,and also have a lot of power.
I think that is AX 20 with 3 pairs, only sir Apex can tell us what model is.
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Hi sir Apex, just have finised the F100 and i have DC on output. The changes we have made is: BF420, BF421 replace with KSP44, KSP92 and 5r6 2w replace with 4r7 3w. Where did I go wrong? I tested the irfp transistors in another amplifier and are okay. Yellow light does not light. Please help my I'm a beginner. Thanks.
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your soldering looks quite dull.
What solder are you using?
I hope it is leaded: 63/37 eutectic
What solder are you using?
I hope it is leaded: 63/37 eutectic
Is a solder from polonia and is very bad solder have much (solder paste) rosin.
It is the first time i`m use this solder.
have a look at some soldering videos, it should look shiny.
recently i was soldering a 3 pin connector from a no name supplier, it wasn't getting soldered at all even after much heating, then i changed to TE 3-pin connectors, it was buttery smooth solder effort.. very very clean finish!
I had a whole roll of solder that that produced a dull finish. It was difficult to keep the tip clean as well. I never had a problem with continuity but it was not fun to use.
well, here you got 2 experiences.... component pin problem or solder wire problem.... take your flavor!