Schematic is the same with parallel just added 2pcs TDA7293 more. I will share all information when I finish pcb.
Hello,
Our TDA7293 amplifier, featuring Bob Cordell's JFET-buffered composite feedback, has been well received by listeners. The amp is appreciated for its detailed yet non-fatiguing sound, delivering balanced performance across all frequencies, with a particularly captivating midrange. To further enhance this amplifier, we've prepared parallel and quad versions. We'll be constructing the quad version before the parallel one.
In the quad version:
Our TDA7293 amplifier, featuring Bob Cordell's JFET-buffered composite feedback, has been well received by listeners. The amp is appreciated for its detailed yet non-fatiguing sound, delivering balanced performance across all frequencies, with a particularly captivating midrange. To further enhance this amplifier, we've prepared parallel and quad versions. We'll be constructing the quad version before the parallel one.
In the quad version:
- We'll replace the Vishay MBB professional series resistors with Dale CMF55 and 60 resistors. As always, Epcos TDK film capacitors will be included on the PCB. We'll use Panasonic FR series onboard reservoir capacitors with 63V rating and the lowest possible ESR values.
- Our transformer will be a 500VA 2x40Vac toroidal transformer from the Toroidy audio grade series, and, as in our previous projects, we'll build a capacitor bank using low ESR capacitors with a total capacity exceeding 15,000uF to prevent excessive bass extension.
- The PCB traces for the power supply and speaker lines will be reinforced with silver wires and solder, and will be terminated with silver binding posts. During the design phase, we can also offer the option to convert the stereo amp into a mono block by adding bridge mode switches, allowing for a total output of up to 600W.
Attachments
Hi sercan
impressive..but are you sure about the transformer? 40VAC is about 56Vdc after rectifier. according to the datasheet (chapter 2.3) it is recommended MAX 50Vdc.
kr
chris
impressive..but are you sure about the transformer? 40VAC is about 56Vdc after rectifier. according to the datasheet (chapter 2.3) it is recommended MAX 50Vdc.
kr
chris
Hello @chriss0212
Sıngle and Paralel pcbs are ready. Quad pcb will be ready a few week later...If you want to PCB please contact with me...
Sıngle and Paralel pcbs are ready. Quad pcb will be ready a few week later...If you want to PCB please contact with me...
Yes I need to do fast them.
second information;
The single version TDA7293's power supply capacitors must be at least 10000uf for each channel and rail. In the cap bank application, we use 5x2200uf for each channel and rail and this is sufficient. In the parallel version, we will make the PSU card as 2x10000uf per channel rail.
5x2200uF measurements
second information;
The single version TDA7293's power supply capacitors must be at least 10000uf for each channel and rail. In the cap bank application, we use 5x2200uf for each channel and rail and this is sufficient. In the parallel version, we will make the PSU card as 2x10000uf per channel rail.
5x2200uF measurements
As always, output power is determined by the supply voltages and load impedance. You can expect more power from paralleled devices only if you decrease impedance.
Btw, this is an impressive amplifier design!
Best regards!
I am sorry. I am too busy nowadays. I will try to measure it at weekend. I have already parallel amp components but I havent soldered yet.
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@Kay Pirinha
thank you.
I get feedback from people who claim that my amp has a stunning midrange. They say the bass and highs are smooth and clean. It's a detailed, musical amp that doesn't overwhelm.
thank you.
I get feedback from people who claim that my amp has a stunning midrange. They say the bass and highs are smooth and clean. It's a detailed, musical amp that doesn't overwhelm.