solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 1, 2015 15:10:39 GMT
I could post them here but they need some verbal explanations as well.
|
|
|
|
Post by jacobjhlee on May 2, 2015 11:38:54 GMT
Before I begin I'd like to double check that I've got something correct.
The 2200uF , 35V capacitors I got came out to be 33mm long, with a diameter of around 14mm.. are these the capacitors that slot onto the L1, and L2 of the PCB, or did I get something entirely different?
|
|
solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 2, 2015 11:47:02 GMT
These capacitors have to go in positions C1 and C2. You may have to bend the pins a bit or lay them flat or something. C1 and C2 were intended to house small 10uF caps. The 2 diodes would have to be mounted on board. You should use ' power supply option 2' as a power supply as described in the filter board. NOTE: The SeNNator schematic is NOT exactly the same as on the filter PCB (component values are correct but the designators DIFFER !I will make a tutorial for this specific PCB so do NOT mount any components on that board yet when you received the board. Use the conversion table below.  You could consider mounting those reservoir/smoothing caps + its diodes off-board. |
|
|
|
Post by jacobjhlee on May 2, 2015 12:43:05 GMT
Now that I look at it. It may be easier for me to create the Power supply on a separate board, and go for Option 1.
|
|
solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 2, 2015 15:11:02 GMT
When you mount the regs on the board you make use of the groundplane and local decoupling from the PCB.
In that light option 2 may be more practical.
No need for cooling the regs anyway.
All you need externally (for the power supply) is 2x 2200uF + 2x 1N400x and a socket for the AC plug.
|
|
|
|
Post by jacobjhlee on May 2, 2015 22:04:34 GMT
That would certainly be easier, though I've been too eager and have already built the power supply.
I've tried plugging in the adapter and measured the output from Ground to +15V, and Ground to -15V, and I guess there's a reason why it's showing nothing. Would I need to set some sort of load first? I have some left over resistors if that helps.
|
|
solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 3, 2015 5:52:47 GMT
No load needed.
It should work fine.
First measure on the reservoir caps.
Then look at the regulators.
|
|
|
|
Post by jacobjhlee on May 3, 2015 10:22:40 GMT
I am unsure what I should be doing whilst measuring the reservoir caps as the cap discharged onto my multimeter. Luckily nothing broke.
As for the regulators, they are giving me 15.03V, and -15.08V.
Because I already put in the decoupling caps on the power supply, would I need to bother putting any additional ones on the board as per Power Option 1?
|
|
solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 3, 2015 10:53:25 GMT
That looks nice (the voltages that is) they may become a (few) mV lower under load.
The absolute value is not of importance here.
Can you tell me the voltages before the regulator ?
They should be at least 3V higher under load.
As a load you can use a 150 to 220 Ohm resistor if you have any.
On the board (option 1) C4 and C5 10uF is O.K.
|
|
|
|
Post by jacobjhlee on May 3, 2015 11:26:28 GMT
I used a 220 Ohm resistor, and interestingly the voltage drops in increments of 0.01 V.
Output continues to stay at 15V whilst resistor gets hot. I stopped once voltage dropped below 1V.
Though this was measured when only one 220 Ohm resistor was put across the ground and one of the -/+ 15V rails.
This might be a measurement error. I'll try again later when I have the chance.
|
|
solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 3, 2015 12:14:40 GMT
One 220 Ohm from +15V to ground + one 220 Ohm from -15V to ground.
Then measure the DC voltages before and after the regulators.
|
|
|
|
Post by jacobjhlee on May 4, 2015 0:42:04 GMT
With one 220 Ohm from +15V to ground and another 220 Ohm from -15 to ground I got the following
"-/+ 1" on the far left of the display, for the voltages before the regulators. Unsure what this means.
"-/+ 15V" for the voltages after the regulators.
Resistors got very hot.
Left the power supply with load running for 5 minutes and the results were still the same.
|
|
solderdude
Administrator
measureutternutter
Posts: 4,886
|
Post by solderdude on May 4, 2015 5:07:25 GMT
Set the multimeter to 200V DC (I suppose it is set at 20V and thus indicating over voltage)
I expect the DC voltages before the regs to be around 22V.
> 20V and < 30V is O.K.
The 220 Ohm is the maximum draw that can occur so your power supply is perfect for the job.
The PCB will be sent today.
|
|
|
|
Post by jacobjhlee on May 4, 2015 11:39:07 GMT
Read the values, and both come up as 22V with a tolerance of a few decimals. Thanks! I'm now looking for a unloved piece of electronics I can re-purpose into a housing. Also, if anyone is looking to use this socket, bear in mind that the centre pin may need some widening before it makes good contact with the adapter tip. A small flathead screwdriver will do the trick. uk.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=15001&langId=44&urlRequestType=Base&partNumber=1216726&storeId=10151 A power supply that suddenly shows 1.3V when it's meant to show 22V is a rather confusing experience.
*Edit* Since an hour of this post, I forgot that I left this power supply running with the (now too hot to touch) resistors . Did another measurement: 22.8V before regulators 15V after regulators First time I've built something on a strip board that worked without needing anything re-soldered. |
|
|
|
Post by ronzo56 on May 4, 2015 14:48:39 GMT
Read the values, and both come up as 22V with a tolerance of a few decimals. Thanks! I'm now looking for a unloved piece of electronics I can re-purpose into a housing. Also, if anyone is looking to use this socket, bear in mind that the centre pin may need some widening before it makes good contact with the adapter tip. A small flathead screwdriver will do the trick. uk.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=15001&langId=44&urlRequestType=Base&partNumber=1216726&storeId=10151 A power supply that suddenly shows 1.3V when it's meant to show 22V is a rather confusing experience.
*Edit* Since an hour of this post, I forgot that I left this power supply running with the (now too hot to touch) resistors . Did another measurement: 22.8V before regulators 15V after regulators First time I've built something on a strip board that worked without needing anything re-soldered. Once you get it working I hope you love it as much as I do. Turns the HD650 from an excellent headphone to one that competes with the most expensive out there. IMHO. |
|
