LTSpice sim of Naim/Avondale amplifier circuit?
- Thread starter bugbear
- Start date
Oops. A quick check of gain/phase on the NCC220 and my old Rotel850 model show them both still with full gain at 100Khz.
I think I need to revisit my understanding of LTSpice "AC Sweeps", and the results thereof.
Frequency/Phase by plybench, on Flickr
I think I need to revisit my understanding of LTSpice "AC Sweeps", and the results thereof.
Frequency/Phase by plybench, on Flickr
I'm seeing some very odd waveforms.
In a bid to isolate the effect (or the fault in my sim...) I've set up the driver/output stage on its own (so TR7/TR8 onwards), and have created the worlds most trivial class A/B bias/driver stage. No FE stage, no feedback. Much simpler.
It's just a Voltage source oscillator, split into 2 voltages via 2 biasing voltage sources. This would not be a practical real world system, but it reflects what a bias setup is meant to do in the simplest way.
as per
https://www.electronics-tutorials.ws/amplifier/class-ab-amplifier.html
(search down for "Class AB Amplifier Voltage Biasing").
Question to wise and knowledgeable: but should I be supplying voltage or current from my faked-up front end? As described and built, it's a voltage system.
In a bid to isolate the effect (or the fault in my sim...) I've set up the driver/output stage on its own (so TR7/TR8 onwards), and have created the worlds most trivial class A/B bias/driver stage. No FE stage, no feedback. Much simpler.
It's just a Voltage source oscillator, split into 2 voltages via 2 biasing voltage sources. This would not be a practical real world system, but it reflects what a bias setup is meant to do in the simplest way.
as per
https://www.electronics-tutorials.ws/amplifier/class-ab-amplifier.html
(search down for "Class AB Amplifier Voltage Biasing").
Question to wise and knowledgeable: but should I be supplying voltage or current from my faked-up front end? As described and built, it's a voltage system.
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