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Simple RIAA pre amp

Simple RIAA Preamplifier using Logic IC CD4069

By Amplifier CircuitPosted on December 25, 2011December 25, 2011

The simple RIAA preamplifier circuit is just to show that we can sometimes change the role of a component. It […]

Mono preamp based on CMOS IC

Mono Preamp based on CMOS IC CD4069

By Amplifier CircuitPosted on November 18, 2011December 23, 2011

Microphone preamp described here is not a professional preamp, but the original preamp and it is cheap and easy to […]