WTB: F4 PCB boards

[carpenter]

Another thing: the regulated pcb requires raw DC, yes? Can the raw DC be obtained from the same pcb as the regulated supply? There may be some Jerri-rigging necessary......

Perhaps it takes two of your pcbs to make the final regulated product?

 

[Peter Daniel]

So there is no need for large value caps in the filtering dept? That's very cost effective.

It will depend on a circuit. Typically 1000-4000uF should be placed before regulator and at least 47uF after. I used 10uF as it worked best with the battery connected to the output.

In my CD player, I use 2200uF before and 1000uF after LM7808 regulator, as those values worked the best.

 

[Peter Daniel]

Another thing: the regulated pcb requires raw DC, yes? Can the raw DC be obtained from the same pcb as the regulated supply? There may be some Jerri-rigging necessary......

The regulated PCB takes AC directly from transformer (if you use on board rectifiers)

 

[carpenter]

I take it the only parts not utilized are the power resistors? It looks as if the large cap holes can be of service. I'm obviously, going to study this at length.

About the Pot. How does it fit in a two hole application?

Thanks for the explanations, Peter.

 

[Peter Daniel]

Yes, the large resistors are only used for power amp aplication and not needed with regulators.

Any standard trimmer will fit here, you just need to form the pins properly (center and one of the outer pins connected together). After setting required voltage a trimmer should be replaced with fixed resistor.

 

[carpenter]

For added versatility, you could add the extra hole for a pot, thus giving folks a variable voltage power supply for lab projects, or a simple, low amperage, variac.

 

[Peter Daniel]

Looking at it now, I could have ad those extra holes. But I never thought anybody would be using those boards for regulators except myself

 

[carpenter]

Ha ha; well if I can catch on, I'm certain the others will, also. Maybe add them to the next run. I'll be ordering more, you can bet!

 

[Peter Daniel]

I still have enough PS boards so I didn't need to order them for this run, only amp boards had to be ordered.

 

[Myron]

Hi Peter, paypal for two amp boards and two psu's on its way! Thanks again for your efforts.
Myron

 

[dake13]

I posted interest before for two stereo boards and two ps boards. I'll take care of payment tomorrow.

thanks Peter

Dake

 

[suds]

Firt Set of PCB's

Hi,

I will get first set of PCB's today..

will scan and send you guys images..





Suds..

 

[suds]

PCB Image file is 2.5MB

File contains images of two sides for Both PCB (Amp and Power)
file size is 2.5 MB.

I have boards in stock..


-suds

 

[tms0425]

Peter,

Hopefully not too late! PP sent for 2 stereo F4 boards and 4 PS boards.

Thanks,

Tom

 

[suds]

Suppose to be F1 PCB thread.

Hi,

I posted this in F4,

suppose to be in F1 PCB Thread..

PCB Image file is 2.5MB Post #613
File contains images of two sides for Both PCB (Amp and Power)
file size is 2.5 MB.

I have boards in stock..
-suds

These are F1 PCB's

Admins, Can you move above quoted post to relevant thread !

 

[tms0425]

Peter,

Hopefully not too late! PP sent for 2 stereo F4 boards and 4 PS boards.

Thanks,

Tom

Peter - Paypal added for 2 more stereo F4 Amp boards. Final tally is 4 Amp and 4 PS boards. Thanks! Tom

 

[RKH]

Hi Peter,
Any update on the boards?

Thanks much.

Ryan

 

[Peter Daniel]

I will check with the supplier today. Last time I was told they should be shipping this week.

 

[ashaw]

financial concerns mean that i have to pull out at this time.

 

[Peter Daniel]

If you want to cancell your order it's not a problem, I will issue a refund. Just contact me through e-mail.