Greetings,
I've been quite interested in diy for several years now, yet I'm still relatively inexperienced with amplifier design and construction. You see, I've designed and built using only op-amps to date.
Recently, I've been trying to design a preamplifier using BJTs. I've laid out some goals for myself: High input impedance, wide bandwidth (DC to 50kHz+), very little negative feedback (I'm not too worried about THD), relatively low output impedance and as little noise from the power supply as possible.
With these goals in mind I settled on a balanced topology with emitter-follower buffers for an output stage. Since my only source is unbalanced, I've been considering a simple emitter-follower buffer as an input stage followed by differential pairs.
I then proceeded to simulate my ideas using what limited simulation software I have. Unfortunately, the only result is that I've had considerable difficulty with my gain stage. After many attempts to design a functional gain stage and just as many stiff necks and sore wrists, I decided to go to the experts.
So I ask you, can you either point me in the direction of a similar preamp, generally accepted for its high quality, or give me a little advice.
Thanks,
Stephen
I've been quite interested in diy for several years now, yet I'm still relatively inexperienced with amplifier design and construction. You see, I've designed and built using only op-amps to date.
Recently, I've been trying to design a preamplifier using BJTs. I've laid out some goals for myself: High input impedance, wide bandwidth (DC to 50kHz+), very little negative feedback (I'm not too worried about THD), relatively low output impedance and as little noise from the power supply as possible.
With these goals in mind I settled on a balanced topology with emitter-follower buffers for an output stage. Since my only source is unbalanced, I've been considering a simple emitter-follower buffer as an input stage followed by differential pairs.
I then proceeded to simulate my ideas using what limited simulation software I have. Unfortunately, the only result is that I've had considerable difficulty with my gain stage. After many attempts to design a functional gain stage and just as many stiff necks and sore wrists, I decided to go to the experts.
So I ask you, can you either point me in the direction of a similar preamp, generally accepted for its high quality, or give me a little advice.
Thanks,
Stephen