[minima] Re: A linear for the Minima
- From: farhanbox@xxxxxxxxx
- To: minima@xxxxxxxxxxxxx
- Date: Mon, 24 Feb 2014 03:12:44 +0000
Adrian,
A couple of suggestions:
1. Use a ground plane. We can etch single side and leave the other side as a
ground plane. This makes the circuit stable ans stackable (it can go over your
main pcb).
2. Keep a provision for upto six filters (we may need them).
3. Keep the filter area and the amp area separate such that we can saw them
out. This will make the linear reusable for other projects as well.
-f
Ps I am working on eliminating two relays from our main board. More later.
Sent from BlackBerry® on Airtel
-----Original Message-----
From: Adrian Preda <ady.preda@xxxxxxxxx>
Sender: minima-bounce@xxxxxxxxxxxxx
Date: Sun, 23 Feb 2014 11:44:48
To: minima@xxxxxxxxxxxxx<minima@xxxxxxxxxxxxx>
Reply-To: minima@xxxxxxxxxxxxx
Subject: [minima] Re: A linear for the Minima
Already started working on the PCB :)
Adrian
YO4HHP
________________________________
From: "jerry@xxxxxxxxxxxxxxxx" <jerry@xxxxxxxxxxxxxxxx>
To: minima@xxxxxxxxxxxxx
Sent: Sunday, February 23, 2014 9:29 PM
Subject: [minima] Re: A linear for the Minima
Now you're cooking Farhan. That is a nice amp. A perfect match for the
Minima, and cheap to build. Jerry
K5LRU
Harwood, Texas
> -------- Original Message --------
> Subject: [minima] A linear for the Minima
> From: Ashhar Farhan <farhanbox@xxxxxxxxx>
> Date: Sun, February 23, 2014 5:34 am
> To: minima@xxxxxxxxxxxxx
>
>
> I just finished a linear amp that is entirely RC-coupled except for the
> power stage's output. I have built two of them and they appear to very
> quite stable and clean. It uses just the 2N3904s in the chain except for
> the power output stage.
>
> The details are here http://www.hfsignals.org/index.php/RF386
>
> It started with the a stupid question "Why can't the LM386 be used in an RF
> linear?"
>
> I am particulary curious to know what value should one pick for the 100
> ohms in the Q4. I am quite kicked by the one-line band-switching
> arrangement.
>
> - farhan
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