It should be OK on -/+20 volts although R3 will need to be lowered to maintain sufficient zener current. 3k9 would seem suitable.
Realistically its probably good for around 16 watts rms into 8 ohms. That assumes it can swing to say -/+ 16 to 17 volts or so. 16 volts peak is 11.3 volts rms which is 15.9 watts rms (8 ohms). You might get a fraction more, or a fraction less.
Hi, the layout looks good, but all the high-current traces, like rails, connections to the collectors/emitters of the output transistors and their emitter resistors, output terminals and the ground - must be as wide and thick as possible.
R18, R19 are 5W - should be much bigger. Also, connections around them - to emitters as well as to the inductor at the output - should be wider. That's where the highest currents will go through.
no in the original project R18,R19 are 2W 0.5 hom but I want use only 20V rail less power less dissipation I hope...
OK, for +/-20V rails 2W is enough.
Simple calculation of the worst case (square wave at full amplitude):
Maximum amplitude = 18V (roughly), at 8 ohm load the current is 18/8 = 2.25A
2.25A * 2.25A * 0.5ohm = 2.53W and you have it half of the time 2.53/2 = 1.265W
Simple calculation of the worst case (square wave at full amplitude):
Maximum amplitude = 18V (roughly), at 8 ohm load the current is 18/8 = 2.25A
2.25A * 2.25A * 0.5ohm = 2.53W and you have it half of the time 2.53/2 = 1.265W
I thought about changing the transistors in the package TO5 type BC140 and BC160 2N1711 or any other suggestion for the transistors? only TO5 package
thanks
thanks
To be honest, for just +/- 20V rails you could go even simpler.
TO-5 is quite obsolete so i dont see why you'd want to use them. I'd consider using flatpak mount devices like TIP2955/TIP3055 or TIP35/TIP36. For the rest, small signal transistors like BC546/BC556 or 2N5401/2N5551 will do perfectly well.
TO-5 is quite obsolete so i dont see why you'd want to use them. I'd consider using flatpak mount devices like TIP2955/TIP3055 or TIP35/TIP36. For the rest, small signal transistors like BC546/BC556 or 2N5401/2N5551 will do perfectly well.
It is ok, but the project is certainly not of recent conception.
I can consider the transistor BC546 / BC556 or 2N5401 / 2N5551 but the final I will use the pair MJ15003 MJ15004
I can consider the transistor BC546 / BC556 or 2N5401 / 2N5551 but the final I will use the pair MJ15003 MJ15004
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