Category Archives: Pre Amplifier

Documenting the build of the first pre amplifiers.

Populating the PCB

The printed circuit board is now being populated.  As you can see I am having to pillage previous versions for parts to keep the cost down; there are some very expensive parts to be bought yet. It feels so good … Continue reading

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Kicad PCB Software 3rd Attempt

I’m finally starting to get to grips with this Kicad software. The first attempt output nothing but errors. For the second attempt I used someone else’s files, having re-written the schematic to suit my circuit. But there were footprints missing and … Continue reading

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Lorlin Plastic Switches

I really do not like using metal switches for HiFi. Electric currents (including small signals) produce magnetic fields in surrounding metalwork. Even aluminium produces some bizzare effects when a magnetic field is introduced to it – look into this on … Continue reading

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To PCB or not to PCB – that is the question (now answered)

Again the board has ‘blown up’. All worked well a couple of days ago but I was working on one channel yesterday and noticed smoke coming from the other! I can’t see what has gone wrong but obviously something has … Continue reading

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Version 3

I have now decided how I am to construct the next version of the boards. Tufnol sheet with no holes (I’ll drill them myself) and terminal pins to connect components to. I’ll use silver plated, single core connection wires which … Continue reading

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New PreAmp boards V2 Constructed

These are the new PreAmp boards using Vero to keep everything in place. The components are soldered very close to each other, much closer than you can get using a pcb. This gives greater control over the signal, less parasitics, … Continue reading

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Power Supply Connections

I’m using the same wire for the supply connections as used for signal.  I always think of power supply lines as signal lines, they just happen to be carrying large signal currents as opposed to smaller ones. The wire is … Continue reading

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