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I need a built PSU for First Watt F5 (HELP)
I need a built PSU for First Watt F5 (HELP)
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Old 20th July 2019, 07:06 PM   #11
fabrice63 is offline fabrice63  France
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Danilo , being a newbie it's not a problem , but you must at least understand a minimum of eletricity , even for the amplifier board

if you connect together the + and the - of each PSU you get your 0 v , and you repeat the job for the second channel , so you need 4 PSU , it's simple as that


but building the PSU board is far more easy than the amplifier board




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Last edited by fabrice63; 20th July 2019 at 07:09 PM.
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Old 20th July 2019, 07:08 PM   #12
Mooly is offline Mooly  United Kingdom
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I need a built PSU for First Watt F5 (HELP)
If you use switching supplies then you need to be sure that the zero volt (0V) of the output is 'free floating' and not connected to mains ground via the mains leads. If this is not the case then the supplies are not suitable.

You get -/+ 24 volts by simply connecting the two outputs of each supply in series, just like you would two batteries.

So you connect the plus 24 volt output of one to the 0V of the other. That connection point then becomes your audio ground and you then have +24 volts and - 24 volts as measured from that point.
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Old 20th July 2019, 07:47 PM   #13
danilom is offline danilom  Italy
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Ok. Thank you. May you suggest me a particular power supply model?
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Old 20th July 2019, 08:08 PM   #14
danilom is offline danilom  Italy
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Every psu has 12V. Ok?
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Old 20th July 2019, 09:34 PM   #15
Ben Mah is offline Ben Mah  Canada
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This is probably not what you want to hear but I suggest you build a First Watt power supply to go with your F5 boards. The power supply is very simple. The advantages are that you will have a First Watt F5 as Nelson Pass intended and you will hopefully be able to trouble shoot it easily whereas switching power supplies are a mystery to most diyers (me included). Imagine a switching power supply stop working a few years down the road - what to do? Whereas a simple First Watt supply would be simple to diagnose. There have been many FW power supplies built by diyAudio members so help is only a few key strokes away.

The First Watt power supply is no more difficult to assemble than the amplifier boards, so if you can assemble the amplifier boards, you can assemble a power supply.

An illustrated guide to building an F5

We were all beginners at one point too.
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Old 20th July 2019, 10:11 PM   #16
xrk971 is offline xrk971  United States
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I need a built PSU for First Watt F5 (HELP)
I have used two 24v 5A SMPS bricks in series with the common as GND on an M2. It works fine, in fact, it has no 60Hz hum. $40 and some soldering will get you there. 2.5A load for both channels poses no problem as that is 1/2 rated capacity.

This is going to be the easiest and least expensive 25w Class A amp PSU you will find. Also you never expose yourself to mains voltages. Make sure the outputs do not have their 0v referenced to earth ground.

SUPERNIGHT Power Adapter, Transformers, Power Supply for LED Strip, Output 24V DC, 5A Max, 120 Watt Max, UL Listed (Output 24V DC, 5A) Amazon.com: SUPERNIGHT Power Adapter, Transformers, Power Supply for LED Strip, Output 24V DC, 5A Max, 120 Watt Max, UL Listed (Output 24V DC, 5A): Electronics

Here’s the FFT at 8vrms into 8ohms (8w):
Click the image to open in full size.
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Old 21st July 2019, 08:40 AM   #17
fabrice63 is offline fabrice63  France
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Quote:
Originally Posted by danilom View Post
Every psu has 12V. Ok?
No , each PSU has 24 v output

.
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Old 21st July 2019, 12:13 PM   #18
vdi_nenna is offline vdi_nenna  United States
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I need a built PSU for First Watt F5 (HELP)
Quote:
I have used two 24v 5A SMPS bricks in series with the common as GND on
Can someone post a quick schematic on how this done? To be safe?

Thanks.
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Old 21st July 2019, 01:36 PM   #19
danilom is offline danilom  Italy
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Yes!
A schematic for we newbye!
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Old 21st July 2019, 03:11 PM   #20
fabrice63 is offline fabrice63  France
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here it is a simple schematic , the adapter are the psu , VGND is the 0 V , so you dont connect it to the chassis



Click the image to open in full size.



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Last edited by fabrice63; 21st July 2019 at 03:16 PM.
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