Chip Amp Survey

Post tags: | chipamp |

f2j thread at diyaudio

The safe way to building a Gainclone (chip amp) power supply for beginners.

Brian Bell - Chipamp

Peter Daniel - AudioSector

Nelson Pass Site

AudioSector LM3875 build log

Firstwatt F2 Build Log

Firstwatt F2 Build Log

Recently Nelson Pass released the schematic for the Firstwatt F2. It’s a current amplifier that can be used to power single driver speakers (eg, single driver speakers, AKG K1000 and possibly other headphones).

Penultimate Zen is the sum of several incremental improvements

Zen Variations 2

Zen Variations 3

Zen Variations 4

The Penultimate Zen is the sum of several incremental improvements to the original Zen amplifier of 1994. Eight years just flies by, doesn’t it? These improvements are contained in parts 2 through 4 of the Zen Variations, and is likely the last version of this amp, although by no means the end of the variations on the theme of single stage amplification.

In part 2 we developed an improved active current source load for the single gain device which is at the heart of the amplifier. Originally designed for the Aleph amplifier series, this current source doubles the output current and significantly lowers the distortion of the circuit over the original constant current source. As the original Zen amplifier is limited in both power and fidelity, this is a welcome improvement.

The original Zen amp is also limited in its rejection of power supply noise, and benefits from having a quiet, stable power supply. In part 3 we discussed some possibilities for power supply regulation for this and other Zen amplifiers.

The final shortcoming we will address in the Penultimate Zen is the low input impedance. Depending on the version and the desired gain and distortion figures, the original Zen amp has an

build pictures

AMB forum



shine7_GCv2_inside.jpg shine7_reg_PS.gif shine7_RGC_heatsink.jpg shine7_RGC_LM3875.jpg shine7_RGC_regulator1.jpg


ebay search for CPU heatsinks

  • cpu passive heatsink

Parts Express Heat Sink

Aluminum Heat Sink Kit 218.44 x 58.42 x 18mm

Penn-Elcom R1196/100 Heat Sink Box 3.54” x 2.0” x 4” L

2U all purpose heat sink box. Suitable for electronic applications, PC mounts, DI boxes, etc.

Penn-Elcom R1199 End Plate For R1197 Heat Sink Box

Endplate for R1197 heat sink boxes. Aluminum construction.

velleman eurocard proto board

Jameco - 2,360 Hole General Purpose Prototyping Board Single Sided 4.5”x6.5”

Jameco SB300 Solderable PC Breadboard 1 Sided PCB Matches 300 Tie-Point Breadboards

zorotools heat sink