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Self Douglas
 Douglas Self has a considerable reputation as an authority on audio power amplifier design, and is well-known for his rigorous, skeptical, and thoroughly practical approach to design. He is responsible for the concept of the Blameless amplifier, which gives very good distortion performance from straightforward circuitry.
Douglas was born in Suffolk, England, and studied engineering at Cambridge University where he achieved first-class honours. He then moved on to study Psychoacoustics at Sussex University. He has spent many years working at the top level of design in both the professional audio and hifi industries, and has taken out a number of patents in the field of audio technology. He gave the Power Amplifier Masterclass at the AES convention in Amsterdam 2008, and is currently mainly engaged in consultancy work. He is a prolific author and the books he has written include: The Audio Power Amplifier Design Handbook, Self On Audio, and most recently Small Signal Audio Design. Douglas is a member of the Audio Engineering Society. |
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 A low-noise preamplifier with variable-frequency tone controls Vol 5
Douglas Self
In 1996, Douglas Self published a design for what became known as the Precision Preamplifier, which included a treble/bass tone control with variable turnover frequencies. Starting with the idea to revisit the design with the benefit of years-long experience and newer parts, the design developed into much more than ‘just’ a tone control preamp. The necessary additional stage to correct the phase reversal of the tone control stage was called up for a Baxandall-type active volume control duty.
Then, reminding himself that we don’t all use symmetrical listening spaces, Douglas realized that a ‘vernier’ balance control would be very useful – but of course without interfering with either the tone or the volume controls. Add to that the need to maintain very low noise and distortion levels, and you have a article that is more like a tutorial on preamplifier design. |
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Self Douglas
