Thanks for the reminder. I see it now, printed on the board! Q10 has been moved. Bias tracks better now. It was creeping up quite a bit before mounting Q10 correctly.🙂
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what are they to be used for?
easy to find alternative would be bc546 and bc556 with same pins.
or you could use 2n5551 and 2n5401 but they have different pins,you just have to rotate these 180 degrees in relation to bc550-560
No, but alexmm made pcb for A23 and this pcb can be easy redesign to AF20 pcb.
One quick question regarding the heat sink size for the AX14 amp. I am using a small size cabinet with the heat sink size being 24.5cm(depth)/11cm(height)/2cm (fins width) and with the bias around -4mV to -10mV its very hot to touch. Some issue with my bias setting or the heat sink size is smaller??
I am checking the bias with the DMM's red wire being on the Q17 mosfet pin and the black wire being on the Output pin. Also I am using a 30+30v transformer secondary as rated below, 4 secondaries.
0-30v @ 2.5A
0-30v @ 2.5A
0-30v @ 2.5A
0-30v @ 2.5A
through the CRC psu which gives a stable +/-47VDC. I hope the voltages are fine for this amp.
Thanks
I am checking the bias with the DMM's red wire being on the Q17 mosfet pin and the black wire being on the Output pin. Also I am using a 30+30v transformer secondary as rated below, 4 secondaries.
0-30v @ 2.5A
0-30v @ 2.5A
0-30v @ 2.5A
0-30v @ 2.5A
through the CRC psu which gives a stable +/-47VDC. I hope the voltages are fine for this amp.
Thanks
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for diy audio use: mj15024/mj15025 Motorolla original is beter or mj115024/mj15025 ON original mexico? wich one is the best ..i have both...however they are very very expensive in my contry...and fake is very much.
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