An Accurate Inverse RIAA Network
Designing and engineering RIAA equalizers demands a clear understanding of the signal chain requirements during the development process. Once components have been committed to a prototype PCB however, testing is required. Presented here is a simple Inverse RIAA Network, or…
Ovation Symphony Line Preamplifier
This is my latest preamplifer design, the Ovation Symphony, featuring Baxandall tone controls, up to 7 inputs and a class A 2 W headphone amplifier and a Goldpoint 24 position attenuator. The write-up describes the design process and choices in…
Ovation nx-Amplifier: A 100 W class AB Current Feedback Amplifier
This power amp design is based on the sx-Amplifier topology, but with the TIS and output stage re-configured for class AB operation, enabling it to deliver 100 W into 8 Ohms. I have kept the design very simple, retaining the…
Ovation e-Amp: A 180 Watt Class AB VFA Featuring Ultra Low Distortion
The e-Amp is a 180 Watt RMS (very conservatively rated into 8 Ω ) fully balanced symmetrical (‘FBS’) amplifier featuring an emitter follower triple (EFT) bipolar output stage and beta enhanced VAS stage. The amplifier can be configured using jumpers…
CFA vs. VFA: A short primer for the uninitiated – Extensively Updated January 2014
There are many explanations about IC CFA topologies like this or this. Some plunge into math, loop gain equations and so forth, leaving the reader none the wiser, while this one (equations 1~4 and associated gain plots) from Hans Palouda…
