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Getting G3 Whisper Perch USB working

croissantking

Well-known member
Swapping in those other caps got it going!

What a great team effort.

I couldn’t actually find any 47pf caps, so I used 200/300 pf ones, but it seems they were close enough.

I’ll have to do some testing - it might not be fully reliable yet.
 

croissantking

Well-known member
@croissantking
I recommend getting one of these :

It will help you work out what the caps and inductors are.
I'll order one... but... just wanted to ask, how would you test those tiny SMD caps? Do you solder it in somewhere? Because the pictures show through-hole components being tested.
 

Fizzbinn

Well-known member
Swapping in those other caps got it going!

What a great team effort.

I couldn’t actually find any 47pf caps, so I used 200/300 pf ones, but it seems they were close enough.

I’ll have to do some testing - it might not be fully reliable yet.

OMG! Awesome!!! Congrats guys!
 

croissantking

Well-known member
So my initial tests are that the keyboard works perfectly, but plugging something into either of its powered USB ports causes the keyboard to stop working. Unplugging the extra device allows the keyboard to come back to life.

A Logitech USB receiver and mouse almost works perfectly, but some of the clicks are lost - the mouse pointer has to be moving for the clicks to register. There seem to be errors building up in the log as this happens.

A USB CF card reader is detected but won't mount my CF card.

A USB Scanner is detected, but won't work.

There also seem to be some issues with unplugging one device and then plugging in another and the USB bus hanging, requiring a restart.

I think we just need to work out the values of those other caps now.
 

croissantking

Well-known member
1679452182124.png
Does this offer a clue as to the value of C113?

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1679452252018.png
If this refers to the caps around the USB chip that are connected to its VCC and VSS pins, I'll need to double check them as I've used 0.1uf on all of them but some need to be 10 uf.
 

Phipli

Well-known member
I'll order one... but... just wanted to ask, how would you test those tiny SMD caps? Do you solder it in somewhere? Because the pictures show through-hole components being tested.
You push them down on the pads that look like a SOT package regulator, or put jumper wires in the socket.
 

Phipli

Well-known member
Swapping in those other caps got it going!

What a great team effort.

I couldn’t actually find any 47pf caps, so I used 200/300 pf ones, but it seems they were close enough.

I’ll have to do some testing - it might not be fully reliable yet.
Congratulations :)
 

cheesestraws

Well-known member
I need to find a layout as well, which I think is what Cheesestraws found. To see where those caps go.

Yes, there's a PCB layout also on that page for an example 2-port USB card. Unfortunately in orcad format and I don't have anything that can read that.
 

Phipli

Well-known member
Minor update.

20230321_205849.jpg

You need to include the other caps you added for me to continue making updates.

(FB is Ferrite Bead)
 
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