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Need help in determining the BJT, what parameters you need to pay attention to in the selection, how much better is 4.2 or 5.2 mA, which force coefficient is more correct or need all the readings to be the same?KASaudio wrote:Hi, everybody. I want to build an amplifier for the B22 headphones. I do not have much experience in this business, so something turned out. I have audio-technica Ath-AD2000X headphones, so I think this amplifier will fit them. At the moment I have a GRADO RA1 amplifier, Audinst HUD-MX2, Lehmann Audio Linear, but I think I really like this one.
amb wrote:Check the hfe of the bipolar transistors. See the “Device matching” section of the β22 website.
amb wrote:Check the hfe of the bipolar transistors. See the “Device matching” section of the β22 website.
amb wrote:R1 is 475Ω in all configurations (or you could simply not install it on the ground channel ) . R2 is 1MΩ for the left/right channels, but use 1KΩ on the ground channel.
amb wrote:R1 is 475Ω in all configurations (or you could simply not install it on the ground channel). R2 is 1MΩ for the left/right channels, but use 1KΩ on the ground channel.
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