Hello folks,
I recently completed soldering a Gardo PH-1 clone, which I've bought via Aliexpress https://www.aliexpress.com/item/1005003264368348.html, but it's available form several resellers on eBay as well. But that's not the point.
I choose this one, as the same seller offers a Accuphase C-3850 kit (either assembled or as a solder kit) which has an identical circuitry in the power supply stage,
both use LM7815 / LM7915 voltage regulators and a KBP307 Single Bridge Rectifier for the AC 15-0-15 input and both came with an JRC 5532D within the kit.
As the power stage is more or less redundant, I'm looking to eventually replace the circuitry to a dedicated board. As there are several topics about the Accuphase C-3850 clone already, I won't go into details within this topic about the power stage.
But I'ld like to hear recommendations about the Gardo PH-1 implementation and to which effect the circuit could be improved to reduce potential noise.
For myself, I'm not really into electrical engineering. But I can hold a soldering iron without burning myself, most of the time 😉 I don't have advanced measuring equipment in terms of audio analysis or function generators. Only my eyes, ears and a multimeter. Thus, I definitely a beginner who is willing to leave his zone of comfort to improve upon the given implementation of this phono stage.
For the moment, the only alterations to the circuit was that I've replaced the JRC 5532 D Op-Amp with a LME49720NA, which has reduced the noise level quite a bit (just based on signal output / full volume amplification)
Here is the schematic the seller is sharing without the specific values of the components:
And the layout of the PCB
And finally, the BOM, more or less.
Sadly, the whole kit came without further instructions, thus not everything is totally clear. But soldering went without issue and the phone stage worked directly.
Otherwise, I'm still in the process to finish the housing for this phono stage as well as the clone of the Accuphase C-3850, which will live in the same enclosure and sharing the same transformer (please cry now if that is a bad idea overall).
And one simple question which I've got - as the pcb design features a common ground pad, should I solder a ground wire to it and connect it to the terminal that is shared with the ground lead from the turntable ? The Accuphase C-3850 also has a common ground pad and I'm asking myself if both or only the phono stage should be wired to that ground terminal.
I recently completed soldering a Gardo PH-1 clone, which I've bought via Aliexpress https://www.aliexpress.com/item/1005003264368348.html, but it's available form several resellers on eBay as well. But that's not the point.
I choose this one, as the same seller offers a Accuphase C-3850 kit (either assembled or as a solder kit) which has an identical circuitry in the power supply stage,
both use LM7815 / LM7915 voltage regulators and a KBP307 Single Bridge Rectifier for the AC 15-0-15 input and both came with an JRC 5532D within the kit.
As the power stage is more or less redundant, I'm looking to eventually replace the circuitry to a dedicated board. As there are several topics about the Accuphase C-3850 clone already, I won't go into details within this topic about the power stage.
But I'ld like to hear recommendations about the Gardo PH-1 implementation and to which effect the circuit could be improved to reduce potential noise.
For myself, I'm not really into electrical engineering. But I can hold a soldering iron without burning myself, most of the time 😉 I don't have advanced measuring equipment in terms of audio analysis or function generators. Only my eyes, ears and a multimeter. Thus, I definitely a beginner who is willing to leave his zone of comfort to improve upon the given implementation of this phono stage.
For the moment, the only alterations to the circuit was that I've replaced the JRC 5532 D Op-Amp with a LME49720NA, which has reduced the noise level quite a bit (just based on signal output / full volume amplification)
Here is the schematic the seller is sharing without the specific values of the components:
And the layout of the PCB
And finally, the BOM, more or less.
Sadly, the whole kit came without further instructions, thus not everything is totally clear. But soldering went without issue and the phone stage worked directly.
Otherwise, I'm still in the process to finish the housing for this phono stage as well as the clone of the Accuphase C-3850, which will live in the same enclosure and sharing the same transformer (please cry now if that is a bad idea overall).
And one simple question which I've got - as the pcb design features a common ground pad, should I solder a ground wire to it and connect it to the terminal that is shared with the ground lead from the turntable ? The Accuphase C-3850 also has a common ground pad and I'm asking myself if both or only the phono stage should be wired to that ground terminal.
As I only realize it now, I've messed up with posting this thread to the analog line level instead of analog source section of the forum. If a moderator would be so kind to move the thread into the correct subsection, I'ld appreciate it ! Sorry for the inconvenience.