It depends on what cut-off frequency is acceptable to you. Note that the 100k Ohm R18 would be parallel to the input impedance of your preamplifier, so that has to be taken into account in the actual resistance value of the high pass filter resistor.
Hopefully an easy question. I am getting ready to wire my PSU. I have never build a PSU before, and I am paranoid about it. I am using a combined IEC/switch/fuse unit. Here is a photo of the wiring diagram:
The switch is on the right in the photo (on is up), AC is on the left, and the fuse is in the middle. Do the two hot primary wires from the transformer connect to the hot load terminal in the photo, and the two neutral primary wires from the transformer connect to the neutral load terminal? 6L6 used a similar switch unit. However, it is a bit different, and the wiring shown in his photos appears to be different. I want to make sure I get this right.
The switch is on the right in the photo (on is up), AC is on the left, and the fuse is in the middle. Do the two hot primary wires from the transformer connect to the hot load terminal in the photo, and the two neutral primary wires from the transformer connect to the neutral load terminal? 6L6 used a similar switch unit. However, it is a bit different, and the wiring shown in his photos appears to be different. I want to make sure I get this right.
The IEC to switch wiring looks correct. I see that it is from this: https://www.instructables.com/Wire-Up-a-Fused-AC-Male-Power-Socket/
As for the transformer connection, that depends on your transformer, whether it is 120V or 240V, and what windings it has.
As for the transformer connection, that depends on your transformer, whether it is 120V or 240V, and what windings it has.
Black and Brown to one pole of switch (hot or neutral, doesn't matter), White and Orange to the other pole.
This is the bridge rectifier I am using for my PSU: https://www.mouser.com/ProductDetail/625-GBPC3502-E4. Does it get mounted directly to the metal chassis, or does it need to be isolated?
Hello Guys,
Need your help. I finished the boards a few weeks ago. Measured voltages and all seemed ok. I set the zero volts (there were 3-4 volts at each board before doing it). Then I broke a finger and could not progress anymore. Last night I did all the connections and also tried to setup the new turntable. Had some problems with the turntable setup (Pro-Ject) due to lack of self knowledge and basic to almost no good instructions from the manufacturer. I still need somehow to check is the turntable is working as supposed.
I have connected everything and no sound at all.
This morning I was reading on Internet about RCA connectors assembly instructions and noticed I have inverted the inside plastic washer with the ground washer, the ground washer is touching the chassis.
I now I need to correct but do you think that this could be the "no sound"?
Thanks.
Need your help. I finished the boards a few weeks ago. Measured voltages and all seemed ok. I set the zero volts (there were 3-4 volts at each board before doing it). Then I broke a finger and could not progress anymore. Last night I did all the connections and also tried to setup the new turntable. Had some problems with the turntable setup (Pro-Ject) due to lack of self knowledge and basic to almost no good instructions from the manufacturer. I still need somehow to check is the turntable is working as supposed.
I have connected everything and no sound at all.
This morning I was reading on Internet about RCA connectors assembly instructions and noticed I have inverted the inside plastic washer with the ground washer, the ground washer is touching the chassis.
I now I need to correct but do you think that this could be the "no sound"?
Thanks.
Attachments
ref. pcb dc+ - ground connections -
are there on one side 2 red and one black cables and
on the other side 2 black and one red ?
are there on one side 2 red and one black cables and
on the other side 2 black and one red ?
While you "may" use BC550, note that the "C" class devices are much higher hfe. I compared the devices with my PEAK. the measured hfe was ~630 while the ZTX450 was 235.
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As mjf pointed out, double check all of your power supply wire voltages. It's harder to visually inspect your images because you've used the same wires for signal as for power supply. Double check the output of the voltage regulators on the PCB. Use the parallel resistors (R3 & R4) and (R31 & R33) as test points with reference to ground to make sure you are getting +/- 24v out of your regulators on each board.
Presuming your power supply is wired correctly, the next thing to explore is Q2 - they are VERY static sensitive and a number of people blow them before their first power up. Double check your small transistors (especially Q4, Q5, Q10, Q11 to make sure you go the orientation correct.
Presuming your power supply is wired correctly, the next thing to explore is Q2 - they are VERY static sensitive and a number of people blow them before their first power up. Double check your small transistors (especially Q4, Q5, Q10, Q11 to make sure you go the orientation correct.