Monthly Archives: March 2011

Power Amps Completed

The power amps have now been connected to the output transistors.  Any aluminium electrolytic capacitors you can see are for de-coupling only, none are used as part of the signal path. Wiring up has proved very time consuming.  It is … Continue reading

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Pillar drills and web sites

You may have noticed the progress bar on the home page has not moved much for the past fews days.  This is because I have been concentrating on getting the web site better sorted.  There were some pages missing and … Continue reading

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PSU Control Board Wiring

Most of the wiring for these boards has now been made.  The only wires not attached are the ones going to the batteries and the ones that will connect power to the amplifiers. The positioning of the relays is now … Continue reading

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Change of Relay Position

The mains input filter is now connected to the power supplies and they have connected to the battery charging circuits and relay drive circuit.  This unit is what can be seen in the photo to this post. The next thing … Continue reading

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Battery Pack

The battery pack is now complete.  The power amps use plus and minus 24V and the pre amp use plus and minus 12V.  If I ever decide to increase the power output of the power amps increasing the batteries to … Continue reading

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Battery Unit Relays

Relays, relays, relay, relays …. Each battery unit has two lots of six, 2 pole change over relays (2PDT).  There are six ‘signal’ and two ‘power’ connections per relay so that’s 96 connections in total.  There are wires everywhere. The … Continue reading

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Charging Circuitry

The charging circuit charges the batteries when mains power is used to supply the amplifiers.  The top section shows the 7812 IC which powers the relays that switch power over when the mains switch on the front of the amp … Continue reading

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