High sensitivity and controlled directivity sonic hallmarks... You got the prototype loudspeaker from Troels or you made your own copy already?
i make my own ,,3 weeks and i have done the speaker... heard them at first with Troels G
i was a bit skeptical with the PA driver,,,but i must say,,they surprised me
but as always,,it also come to a matter off taste,,,
i was a bit skeptical with the PA driver,,,but i must say,,they surprised me
but as always,,it also come to a matter off taste,,,
Beardman, thank you very much! Troels' speakers are well known for excellent dispersion and it's really interesting to apply that on vintage legendary designs.
Here is the one I will be providing with optional kits for BC327-40 in the next GB.
Of course anyone who has existing boards can purchased 4 of these with matched quad of BC327-40.
Mouser part : 535-03-0518-10
03-0518-10 Aries Electronics | Mouser
I am not a fan of cutting those pieces into smaller units.
hi Tea
can vi order the bc327-40 with socket on the same GB as the Salas UBIB,,and then get them together with the Salas supply
can vi order the bc327-40 with socket on the same GB as the Salas UBIB,,and then get them together with the Salas supply
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Not to forget mentioning, the DCG3 boards from now on will be marked V1.03. I found the time to do little things, and I asked CRT to retouch on it, like I thought of a way to have the relay's resting position at GND and not at NC (no connection) but not to be shorting the output either, broke the ground lane in two channels and put bridge pads underneath so your grounding scheme in builds can be fully flexible, there is J3 printed for the BF256 on the board too as in the schematic now, not Q5. Performance wise nothing changes, just little perfectionist touches on the board's practicality.
Attachments
But clip those transistor legs shorter for less inductance and better mechanical rigidity 😉
Did I just kill a channel?
I powered up one side of the DCG3 using dual mono Ultra BiB. The output voltage measured 16V8 after the diodes came on and the relay clicked.
I also fiddled on the VR1 but there wasn't any effect.
I only realized that the BOM called for plastic TO-220 grommets when I was checking for digital continuity on the stainless steel mounting screws of the MOSFETs. I did use the SIL-pads between the chassis heatsink though.
I measured the resistance between the MOSFET legs of M1, M2 and M3 with the un-powered channel, they seem to match.
The weird thing is I had done the same mounting for the MOSFETs of the UBiB and it didn't complain / smoke.
Did I kill the baby?
I powered up one side of the DCG3 using dual mono Ultra BiB. The output voltage measured 16V8 after the diodes came on and the relay clicked.
I also fiddled on the VR1 but there wasn't any effect.
I only realized that the BOM called for plastic TO-220 grommets when I was checking for digital continuity on the stainless steel mounting screws of the MOSFETs. I did use the SIL-pads between the chassis heatsink though.
I measured the resistance between the MOSFET legs of M1, M2 and M3 with the un-powered channel, they seem to match.
The weird thing is I had done the same mounting for the MOSFETs of the UBiB and it didn't complain / smoke.
Did I kill the baby?
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Checked all the resistor values in position against BOM. I only powered up the left channel, do I need to have both up at the same time?
Mosfets metal tabs should not show electrical continuity to the chassis. The Ubib's current limiting function can protect for over-current damages. You should power both channels, because the op-amp feeds from the left side PSU while the relay circuit feeds from the right side PSU. A healthy working Mosfet should show few Volts VGS (DC voltage between its left and right legs).
What is the recommended fuse for the dual mono 230V 80VA line DCG3?
I used a 600mA fuse earlier and that blew after I flipped the DCG3 over to drill and attach the feet for the chassis. Not that I drilled into the PCB but likely that the components moved.
I will disconnect the DCG3 from the UBiB v1.3 to investigate after I get a fuse replacement.
I used a 600mA fuse earlier and that blew after I flipped the DCG3 over to drill and attach the feet for the chassis. Not that I drilled into the PCB but likely that the components moved.
I will disconnect the DCG3 from the UBiB v1.3 to investigate after I get a fuse replacement.
Additional information - I am using 2R7 resistors for R1 in the dual mono shunts. So that draws circa 222mA per shunt - adding up to 888mA.
Looks like I need a 900mA or 1A, fast acting fuse?
Looks like I need a 900mA or 1A, fast acting fuse?
Talking AC mains primary fuse? One per transformer or one common for both at the side of IEC mains connector? What mains you got in Singapore? 230V/50Hz?
P.S. If you will not find any short, the explanation could be that the fuse wire was getting too hot so it weakened and snapped from the drilling vibration.
Yes AC primary fuse. I have a single one which leads to the 2 primaries. 230V/50Hz in Singspore.
Yeah. I did not find anything short, esp. checking the metal tabs for continuity.