There are still 4 sets of PCBs for sale with which you can create / upgrade the Fantom CX900 audio amplifier in the new CX900mk2, as in the following topic:
Modernizare Fantom CX900 - Modernizari / reconditionari aparatura electronica - Portalul Tehnium Azi
For the modernization or development of the new Fantom CX900mk2 I developed two personal projects:
1. DP0154 (audio amplifier);
2. DP0812 (230VAC softstart for transformer & auxiliary sources for the new CX900mk2).
The DP0154 project is based on two PCBs: left and right, which are based on the same electronic schematic. The DP0154 project is in PDF format and will be delivered after the purchase of the PCB set presented below.
In general, the DP0154 design is built around transistors MJ15024 / 15025 (also four pairs of transistors per channel). An operational amplifier such as OPA134PA or LME49710 is used on the input side. And a PCB Left (or Right) has three supply voltages:
+/- 50 ... + / - 80Vdc (amplification stage supply);
+/- 15Vdc (power supply preamp section) and
+ 24Vdc for the protection / delay part, connection of acoustic enclosures, with relay.
A PCB DP0154 (CX900mk2) contains all the necessary circuits, including DC protection of the speakers, delay connection of the speakers, limitation of the output current through the final transistors,
input gain operational amplifier with adjustable gain to adjust the input sensitivity of the whole PCB etc.
The DP0812 project is a free project that I have attached below and is part of the collection of personal projects that can be accessed here:
"donpetru" projects - Portalul Tehnium Azi
So, a PCB set consists of:
1 piece PCB left - DP0154 (CX900mk2);
1 piece PCB right - DP0154 (CX900mk2);
1 piece PCB DP0812
4 pieces of aluminum radiator (L profile, 50x30mm, 5 mm thick). So, you will have to drill these heatsinks and attach them to a larger heatsink. In the project documentation DP0154 there is a page with a template to help you with this operation.
A PCB set costs 30 Euros and transport by national mail costs about 15 Euros, for sending to European Union countries. For other countries or locations, please contact me to communicate the exact shipping price.
Payment will be made in advance via paypal to an address that will be communicated by private messaging. So, please ask me!
It is a project that should not be missing from the library of any audiophile.
I have attached some images with these PCBs and with the project in PDF format DP0812. I repeat, the other DP0154 project will be delivered after the purchase of at least one set of PCBs like the one in the images presented below (I presented an image with the top side and one with the bottom side).
Modernizare Fantom CX900 - Modernizari / reconditionari aparatura electronica - Portalul Tehnium Azi
For the modernization or development of the new Fantom CX900mk2 I developed two personal projects:
1. DP0154 (audio amplifier);
2. DP0812 (230VAC softstart for transformer & auxiliary sources for the new CX900mk2).
The DP0154 project is based on two PCBs: left and right, which are based on the same electronic schematic. The DP0154 project is in PDF format and will be delivered after the purchase of the PCB set presented below.
In general, the DP0154 design is built around transistors MJ15024 / 15025 (also four pairs of transistors per channel). An operational amplifier such as OPA134PA or LME49710 is used on the input side. And a PCB Left (or Right) has three supply voltages:
+/- 50 ... + / - 80Vdc (amplification stage supply);
+/- 15Vdc (power supply preamp section) and
+ 24Vdc for the protection / delay part, connection of acoustic enclosures, with relay.
A PCB DP0154 (CX900mk2) contains all the necessary circuits, including DC protection of the speakers, delay connection of the speakers, limitation of the output current through the final transistors,
input gain operational amplifier with adjustable gain to adjust the input sensitivity of the whole PCB etc.
The DP0812 project is a free project that I have attached below and is part of the collection of personal projects that can be accessed here:
"donpetru" projects - Portalul Tehnium Azi
So, a PCB set consists of:
1 piece PCB left - DP0154 (CX900mk2);
1 piece PCB right - DP0154 (CX900mk2);
1 piece PCB DP0812
4 pieces of aluminum radiator (L profile, 50x30mm, 5 mm thick). So, you will have to drill these heatsinks and attach them to a larger heatsink. In the project documentation DP0154 there is a page with a template to help you with this operation.
A PCB set costs 30 Euros and transport by national mail costs about 15 Euros, for sending to European Union countries. For other countries or locations, please contact me to communicate the exact shipping price.
Payment will be made in advance via paypal to an address that will be communicated by private messaging. So, please ask me!
It is a project that should not be missing from the library of any audiophile.
I have attached some images with these PCBs and with the project in PDF format DP0812. I repeat, the other DP0154 project will be delivered after the purchase of at least one set of PCBs like the one in the images presented below (I presented an image with the top side and one with the bottom side).
