Preamps and Buffers for DIY Stereo & Home Theatre

Everything you need for your DIY media system in one place. 

Purifi 1ET400A/Hypex NC500 Input Buffer

Get improved sound quality with this one-of-a-kind input buffer. It provides a differential output for the Class D amplifier, even if the input to the buffer is single-ended. 

Learn more about the Purifi/Hypex Input Buffer here: »Purifi 1ET400A/Hypex NC500 Input Buffer.

Universal Buffer

This two-channel stereo buffer can be configured to provide various functions, including single-ended to differential conversion, signal inverter, and much more.

Explore the full features of the Universal Buffer here: »Universal Buffer.

Input Selector

This relay-based input selector supports the selection of up to 6 stereo inputs and can be used as a:

• Passive preamp 
• Active preamp
• Preamp with gain 

Compatible with 3.3 - 5.0 V CMOS logic levels, this input selector is a great allrounder with great possibilities. 

Read more about the Input Selector here: »Input Selector.

Selector Switch & Volume Control

This 2-part circuit board is intended for use with the Input Selector and contains two boards separated by a V-score. One part is the rotary switch selector switch with LED indication of the selected setting. The other part is the volume control, which features an ALPS RK271-series "Blue Velvet" potentiometer. 

Learn more about the Selector Switch & Volume Control here: »Selector Switch & Volume Control.

Differential Volume Control

Form a fully differential (balanced) volume control with the 4-gang ALPS "Blue Velvet" (RK271-series) volume pot. Build a fully balanced passive preamp by adding the input selector and selector switch. 

Learn more: »Differential Volume Control.