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First time F5 build
First time F5 build
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Old 28th September 2018, 02:34 AM   #1
jakesnake1 is offline jakesnake1  United States
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Location: Agoura Hills, CA
Post First time F5 build

Okay guys I'm sorry in advance because I'm sure this has been addressed before but I'm completely out of my depth and having trouble finding a step by step guide to building the PSU. I found the transformers but I am unsure which capacitators to use for a regular F5 build. Which brand, type, voltage, mF, etc.


Thank you, I can't wait to hear this thing!
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Old 28th September 2018, 03:24 AM   #2
Dennis Hui is offline Dennis Hui  Canada
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First time F5 build
Here's a power supply build guide:

diyAudio Power Supply Circuit Board v3 illustrated build guide

The standard FW power supply schematics is here: (see p.14)

http://www.firstwatt.com/pdf/prod_f4_man.pdf

As for caps, given they'll be in a class A amp you might consider higher temp (105C)
and 35V+ voltage ratings.
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Old 28th September 2018, 03:34 AM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by Dennis Hui View Post
As for caps, given they'll be in a class A amp you might consider higher temp (105C)
and 35V+ voltage ratings.
Definitely worth it, they will last much longer.
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Old 28th September 2018, 05:57 PM   #4
jakesnake1 is offline jakesnake1  United States
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Thank you! That was immensely helpful. Are the antek 4218 a good choice for the power supply?

And I just wanted to clarify that all that is needed to make an F5 is the two Amp circuits and the PSU correct? I'm seeing some build threads using softstart, rectifier, etc.
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Old 28th September 2018, 06:10 PM   #5
invaderzim is offline invaderzim  United States
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The rectifiers are what turns the AC into DC and the soft start is the thermistor wired into the power input leads.
Attached Images
File Type: jpg temp.jpg (53.0 KB, 342 views)

Last edited by invaderzim; 28th September 2018 at 06:32 PM.
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Old 28th September 2018, 07:34 PM   #6
jakesnake1 is offline jakesnake1  United States
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Join Date: Sep 2018
Location: Agoura Hills, CA
So these are necessary to build a functioning amplifier? Or just nice bits to have. Also I'm taking a look at parts for the PSU and once again I'm a little confused. I read that the T0-247 are the way to go for resistors, but i checked out mouser electronics and I have no idea what the correct resistance is. Does it matter? Is this something I should be able to figure out myself?
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Old 28th September 2018, 09:01 PM   #7
Dennis Hui is offline Dennis Hui  Canada
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First time F5 build
The Antek AS4218 is an excellent choice.

AS-4218 - 400VA 18V Transformer - AnTek Products Corp

A TO-247 packaged resistor is usually a very high wattage one (say 50 to 100W).
You don't need anything like that in building an F5. For the power resistors,
the Panasonic 3W ones are a popular choice. For the smaller ones, standard
1/4 to 1/2 watt through hole 1% metal film resistors will be fine.

Cheers,
Dennis
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Old 28th September 2018, 09:02 PM   #8
Hikari1 is offline Hikari1  United States
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Quote:
Originally Posted by jakesnake1 View Post
So these are necessary to build a functioning amplifier? Or just nice bits to have. Also I'm taking a look at parts for the PSU and once again I'm a little confused. I read that the T0-247 are the way to go for resistors, but i checked out mouser electronics and I have no idea what the correct resistance is. Does it matter? Is this something I should be able to figure out myself?
This might help you:

An illustrated guide to building an F5

You can buy boards, download BOM (Bill of materials) here:

F5 – diyAudio Store

T0-247 is the case shape of the resistor....has nothing to do with the resistance value. And yes, the resistance value is important. And they are, for you, probably not the way to go (expensive, they won't fit the boards in places and they are way overrated for wattage in most positions). Stick to the guide and BOM.

And yes, some of this stuff you should be able to figure out on your own before you build the amplifier. Otherwise, it's going to be very frustrating. But you will get there. Keep studying. Don't work on anything involving voltage from the wall (mains voltage) until you understand what you are doing. For safety's sake.
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Old 28th September 2018, 09:03 PM   #9
silasmellor is offline silasmellor  Denmark
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First time F5 build
They are part of the PSU. You can also look in the f6 build guide for some additional detail. Use 3-5w resistors, wirewound is fine, Panasonic makes some nice 3w ones that are used by many.
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Old 28th September 2018, 09:40 PM   #10
jakesnake1 is offline jakesnake1  United States
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Okay, this is actually starting to make sense to me. All of your guidance has been indispensable. So just to be clear. I'm looking for 3w Panasonic 2.2k Ohm resistors? Sorry for the redundancy but this is my first time building any sort of electronic and as Hikari1 says, Safety First Also does the resistance matter on the capacitors?
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