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Audio Design Guide 2014 Power Follower
Audio Design Guide 2014 Power Follower
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Old 20th June 2018, 01:53 PM   #1
vdi_nenna is offline vdi_nenna  United States
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Default Audio Design Guide 2014 Power Follower

I posted this in Solid State Forum first, but after 150 views, no one has any idea, so I'm requesting help from the might Pass Labs forum. Also, I directly emailed and contacted the author on one of his threads regarding this very design, but no answer.

It's a MOSFET Power Follower so it's not alien to the PL guys here.
So, any help or advise would be appreciated.

Original post:

I have some questions about the Andrea Ciuffoli 2014 Power Follower.

The new 2014 schematic and 2014 board do not include the output cap.
Is the output section built the same way as the older schematic?

I assume the positive speaker connection, if built like the '99 version, connects to the positive side of the output cap. This correct?

Is the 1k resistor needed across the speaker on the 2014 version

The 2014 schematic shows R10 and R11. Are both needed?

The '99 Power Follower Schematic is not label with a date. The 2014 schematic is labeled.



Thanks,

Vince
Attached Images
File Type: gif Follower_99d.gif (15.8 KB, 217 views)
File Type: gif PF2014_pcb.gif (111.6 KB, 214 views)
File Type: gif PF2014_sch.gif (23.4 KB, 210 views)
File Type: jpg Power Follow 2014 Boad Pic.jpg (176.9 KB, 205 views)
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Old 20th June 2018, 03:02 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Audio Design Guide 2014 Power Follower
Iq 3A??
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Old 20th June 2018, 03:08 PM   #3
vdi_nenna is offline vdi_nenna  United States
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Is this a rhetorical question or are you concerned by it being too much?
New version is fixed by R1. Old version can be switched.
That's what the man said. Is that too much?

Is it any crazier than 2.5A for the MoFo? I don't know. MoFo sounds great at 2.5A
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Old 20th June 2018, 04:02 PM   #4
indra1 is online now indra1  Indonesia
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Quote:
Originally Posted by vdi_nenna View Post
... any help ...
Is the output section built the same way as the older schematic? Yes, but no provision to alter bias.

I assume the positive speaker connection, if built like the '99 version, connects to the positive side of the output cap. This correct? Depends on what you want. I think there should be no problem to connect Negative polarity of speaker to positive leg of output cap if you prefer negative H2 phase.

Is the 1k resistor needed across the speaker on the 2014 version. Yes, to avoid unwanted dc potential build up on output terminal due to output capacitor.

The 2014 schematic shows R10 and R11. Are both needed? No, choose one.
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Old 20th June 2018, 04:04 PM   #5
Zen Mod is offline Zen Mod  Serbia
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too much

two trimpots on schematic - just provison to mount two different physical styles - see pcb - mount one you prefer to fiddle with

resistor across speaker is bleeder - to drain outout cap and prevent plop! when connecting speaker

output node is at negative potential , ref. to gnd , so output cap must have negative pole at output node , positive to speaker

edit: indra was faster
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Old 20th June 2018, 04:14 PM   #6
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Thank you both! Much appreciated!
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Old 20th June 2018, 04:27 PM   #7
vdi_nenna is offline vdi_nenna  United States
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E/I = R, so .7v/2.3A= .304 R

Could take the current down with a .3 Ohm 3w resistor.
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Old 20th June 2018, 04:46 PM   #8
Zen Mod is offline Zen Mod  Serbia
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I prefer MoFo .....

certainly livelier , due to principle
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Old 20th June 2018, 05:40 PM   #9
vdi_nenna is offline vdi_nenna  United States
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Quote:
Originally Posted by Zen Mod View Post
I prefer MoFo .....

certainly livelier , due to principle
You built both or you just looking at the schematics?

Not worried because only paid for the boards. Rest of parts and case are spares. Got an $100 gift card at work and used Amazon to buy the rest I didn't have.

Not afraid to give this interesting circuit a try.
How many power amps can be built with one small filter cap?

I have no idea how it will sound. Just interested in Power Follower sound right now. Maybe I'll dump this one and build a couple of F4 monos and live happily ever after. who knows

Thanks for the help!

Vince
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Old 20th June 2018, 05:58 PM   #10
vdi_nenna is offline vdi_nenna  United States
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BTW, there's also this power supply version.
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