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PIC16F88 firmware and source code for the Low Noise Preamplifier with Remote Volume Control
Firmware (HEX file) and assembly language source code for the Low Noise Stereo Preamplifier with Remote Volume Control for the 20W Class A Amplifier.
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Preamp & Remote Volume Control PCB for the Ultra-LD Mk3 [01111111]
PCB for the Preamplifier & Remote Volume Control for the Ultra-LD Mk3 Amplifier. Can also be used to build the 20W Class-A amplifier (note: there are some slight differences in connectors).
PCB with plated through holes, solder mask and silkscreen overlay.
201 x 63mm.
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Speaker Protection and Muting Module PCB [01207071]
PCB for the Speaker Protection And Muting Module.
Suits the original version (July 2007) and updated version (October 2011). Can be used to build the 20W Class-A Amplifier.
Double-sided PCB with plated through holes, solder mask and silkscreen overlay (single-sided design).
112.5 x 80mm.
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20W Class-A Amplifier Power Supply PCB [01105074]
Power supply circuit board for the 20W Class A Amplifier.
This is the revised version with provision for chokes to reduce transformer buzz, as described in the April 2011 issue. However they can be replaced with wire links if they are not needed. Thus the board replaces the original which was coded 01105073 and was approximately the same size.
Double-sided PCB with plated through holes, solder mask and silkscreen overlay.
157 x 73mm.
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20W Class-A Amplifier Module PCB, left channel [01105071]
Left channel circuit board for the 20W Class A Amplifier.
Double-sided PCB with plated through holes, solder mask and silkscreen overlay. There's no need to install the wire links as top layer tracks take their place.
146 x 80mm.
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20W Class-A Amplifier Module PCB, right channel [01105072]
Right channel circuit board for the 20W Class A Amplifier.
Double-sided PCB with plated through holes, solder mask and silkscreen overlay. There's no need to install the wire links as top layer tracks take their place.
146 x 80mm.
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PIC16F88-I/P programmed for the Low Noise Stereo Preamplifier with Remote Volume Control
PIC16F88-I/P 8-bit micro-controller programmed with the software for the Low Noise Stereo Preamplifier with Remote Volume Control to suit the 20W Class A Amplifier.
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Speaker Protector and Muting Module PCB pattern (PDF download) [01207071]
PDF with the PCB design for the Speaker Protector and Muting Module (single-sided).
Can be used for both the original design (July 2007) and the updated version (October 2011).
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20W Class A Low Noise Stereo Preamplifier/Remote Volume Control PCB pattern (PDF download) [01208071]
PDF with the PCB designs for the Low Noise Preamplifier with Remote Volume Control for the 20W Class A Amplifier (single-sided).
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20W Class A Amplifier Module PCB patterns (PDF download) [01105071/2]
PDFs with the amplifier module PCB designs for the 20W Class A Amplifier (single-sided).
The two channels use mirror image modules so there are two PCB patterns. 01105071 is for the left module and 01105072 for the right.
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20W Class A Amplifier Power Supply PCB pattern (PDF download) [01105073]
PDF with the PCB designs for the 20W Class A Amplifier Power Supply (single-sided).
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