rd15hvf1 wide band

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mountainman
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Re: rd15hvf1 wide band

Post by mountainman » Wed Nov 01, 2017 12:08 am

A board is born:
(Damnit I forgot to mirror it before etching! Guess I'll be building it backwards.....)
IMG_20171031_132116.jpg
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Radio Garfield
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Re: rd15hvf1 wide band

Post by Radio Garfield » Wed Nov 01, 2017 7:38 am

You can get away with this mirror thing. As You can see input and output solder tabs are similar enough.
You can not do mirror soldering as you said. MOSFET will be the obvious problem. Another thing! If you still have copper on the other side make sure to do some connections between layers ( like on image of that very small board that you posted before). For that purpose you can use elements that are connecting on the ground. Simply drill a hole and solder it on both sides of PCB. You dont need to drill all the holes on that PCB for the components that are solder on the surface. Just solder them on those islands. You can see many photos on the webs.

I have played many times with that amp and it is fine. It gives 15W easy. Its datasheet tells a lot.

radium98
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Re: rd15hvf1 wide band

Post by radium98 » Wed Nov 01, 2017 4:28 pm

wrong no photos for this amp on the web except the one i did and i think you mistaken with me i am the beginnr of the thread and this amp dont put with me enough output so why i suggest to post a video when you finish it to see what i am wrong with that i dont think i have i will upload some photos

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Re: rd15hvf1 wide band

Post by radium98 » Wed Nov 01, 2017 4:45 pm

photos
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Re: rd15hvf1 wide band

Post by mountainman » Wed Nov 01, 2017 6:20 pm

Radio Garfield wrote:
Wed Nov 01, 2017 7:38 am
You can get away with this mirror thing. As You can see input and output solder tabs are similar enough.
You can not do mirror soldering as you said. MOSFET will be the obvious problem. Another thing! If you still have copper on the other side make sure to do some connections between layers ( like on image of that very small board that you posted before). For that purpose you can use elements that are connecting on the ground. Simply drill a hole and solder it on both sides of PCB. You dont need to drill all the holes on that PCB for the components that are solder on the surface. Just solder them on those islands. You can see many photos on the webs.

I have played many times with that amp and it is fine. It gives 15W easy. Its datasheet tells a lot.
The PCB is single sided. I have yet to delve into double sided boards.

I was planning on soldering everything on the non-copper side of the board instead of on the copper side. I think the Mosfet is the only thing I'm gonna have to think about before soldering. I should be fine to basically flip the board over, place components through the holes I drilled into the pads that are indicated on the diagram, and make sure I have the mosfet in the right orientation right?

I built it with FR4. That stuff takes a lot longer to acid etch than the 1/2oz board!
radium98 wrote:
Wed Nov 01, 2017 4:45 pm
photos
Thanks for the pics. Those are the first I've ever seen of this amp actually complete! Did you find that the coil spacing on the 2 and 3 turn coils was ok? I was going to re drill the pads to get the coils a lot closer together instead of spread apart. Not sure if I'm on the right track with that idea though......

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Radio Garfield
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Re: rd15hvf1 wide band

Post by Radio Garfield » Thu Nov 02, 2017 6:31 am

radium98 wrote:
Wed Nov 01, 2017 4:28 pm
wrong no photos for this amp on the web except the one i did and i think you mistaken with me i am the beginnr of the thread and this amp dont put with me enough output so why i suggest to post a video when you finish it to see what i am wrong with that i dont think i have i will upload some photos
I was talking about the way how to solder components, not about your amplifier. I was talking about images on the web where you can see thru holes to connect both sides of the board.

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Re: rd15hvf1 wide band

Post by radium98 » Thu Nov 02, 2017 6:48 pm

Radio Garfield no problem it is okey.

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Re: rd15hvf1 wide band

Post by radium98 » Wed Sep 12, 2018 6:29 pm

did u continue and finished the amplifier ,what are the results.

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Re: rd15hvf1 wide band

Post by Albert H » Thu Oct 11, 2018 1:10 am

The FRB design is reasonably broadband and gives 15 Watts for 200mW drive at 13.8V supply. I built a couple of these recently for a friend, and they both worked first time. Stephen Dunifer got the design right!
15 Watt FET FM Amp Rev 2.png
The two I built were clean and stable.
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radium98
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Re: rd15hvf1 wide band

Post by radium98 » Thu Oct 11, 2018 8:24 am

Can you supply the pcb layout or impossible to see whats wrong in mine

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Re: rd15hvf1 wide band

Post by shorty » Thu Oct 11, 2018 10:51 am

15 Watts for a fiver, good value for money amplifier.

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Re: rd15hvf1 wide band

Post by radium98 » Thu Oct 11, 2018 10:59 am

What do you mean by that shorty .have you ever looked up at the same pa i made .are you talking thi to me or i misunderstand you .

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Re: rd15hvf1 wide band

Post by shorty » Thu Oct 11, 2018 12:23 pm

What i was saying it is inexpensive to build but gives you a good power output for a low power station, a fiver is five pounds.

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Re: rd15hvf1 wide band

Post by radium98 » Tue Oct 16, 2018 8:58 am

@shorty it is not working with me i dunno why after many tests and changing two pieces of transistors :(

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