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ND6T AGC and Click kit wiring notes


Timothy Fidler
 

..WARNING WArning.re chip subs for audio ref Eddie E - the TDA 7052AT is what Leon used. the  A and non A suffix versions are different in volume control area. Stick with Leon's AGC concept  if you go this way.                  https://www.nxp.com/docs/en/data-sheet/TDA7052A_AT.pdf


Timothy Fidler
 

Eddie E Lucky day with the socket  the TDA7052 is your friend AGC is built in . I believe Futurlec.com  may still sell it if so it will be just pennies and F does not have any MOQ as far as I know. Never buy just one. Perhaps Leon as per below might do you a deal on two chips (but if he has inventory problems he won't . Don't muck him around. I need him.). May not be pin compat (you work it out ). well you can use a machined pin IC socket to bring out the existing socket to a piece of Veroboard and wing it.  Now look up Ozqrp.com  Find your way to the MST 3 schema via the documents section.   Look at audio section of the schematic . AGC Is is all there. Leon in NSWales . He is owner of Ozqrp has been doing AGC as std on his monobanders for  6 years and he only lives at the bottom of the world !!! .

Notice the L08 reggy driving the TDA... that is because Leon is a Pro. and checks this stuff out.  he has an interesting reversed voltage protection on his PCB too.  No fuse , no crowbar and essentially no voltage drop. 


Eddie Esserman
 

One more question, folks:

I have one of later run V3 kits with socket mounted 2822M chipset.  It works fine, and is SOCKET mounted.  Wonder if anyone has played with a substitute that pops in and might offer some (audio level albeit) AGC?  Just a thought.  I dunno what's out there, and what has been tinkered with.

Eddie


Eddie Esserman
 

Nick,

Hi, any eta on the AGC kits?  Just finished the V3 ubitx: it needs AGC or I will need new ears. 

Thanks.

Eddie


Richard Spohn
 

Pot, definitely - Rich WB2GXM

On 8/2/18, Nick VK4PLN <nickpullen@...> wrote:
Hi Again.

Would folks prefer the Pot to adgjust the ACG or the Jumpers as per Kees'
boards?

I am in 2 minds about it,,,

73 Nick. VK4PLN




Scott McDonald
 

Both if it’s easy?😳

72 Scott ka9p

Make something good happen!

On Aug 2, 2018, at 6:37 PM, Nick VK4PLN <nickpullen@...> wrote:

Hi Again.

Would folks prefer the Pot to adgjust the ACG or the Jumpers as per Kees' boards?

I am in 2 minds about it,,,

73 Nick. VK4PLN


Kevin Rea
 

never mind.. i just received it today.

thanks,
kevin rea


Nick VK4PP
 

Hi Again.

Would folks prefer the Pot to adgjust the ACG or the Jumpers as per Kees' boards?

I am in 2 minds about it,,,

73 Nick. VK4PLN


Nick VK4PP
 

HI Again,
Just PCB boards. I am still designing them, and awaiting a new callsign too, so, I am hopin in the next week or so to get all my current board designs finalised and then place and order.

One more pic of the VK4PLN ND6T AGC board:


73 Nick VK4PLN


Kevin Rea
 

Hello, do you know if you have possibly shipped my unit?
Kevin Rea


Richard Spohn
 

Nick, would like to obtain 2-3 of your AGC PCB boards. If you are
planning a kit with parts, I can wait for that too. - Rich WB2GXM

On 8/1/18, Nick VK4PLN <nickpullen@...> wrote:
On Thu, Aug 2, 2018 at 06:36 AM, Kees T wrote:


I'm going to quit and pass the torch to someone else. Order rates have
dropped off some, so maybe everyone who wanted a mini-kit has one ??
HI Kees K5BCQ,  Don, ND6T
Would it be OK for me to use this design to produce and supply blank boards
to the ubitx community? I will do these at cost price...

Cheers.
73 Nick VK4PLN




Nick VK4PP
 

Thanks all for sugestions....

Rich, This one is the same as Kees' in operation: RF
I was also wotking on an AF (VK3YE board) version for those who would prefer that...


73 Nick.


Richard Spohn
 

Nick, it is my understanding that Kees' AGC kit works of the RF (IF)
stage, whereas your kit works off the audio stage? Thanks - Rich
WB2GXM

On 8/2/18, Nick VK4PLN <nickpullen@...> wrote:
Thanks Kees, I hope Don ND6T is also OK....

So far I have this. The intention is to fit it next too my HPF on the
ubitx... basically the same as yours Kees, just with components face up.
and TH also, and a pot for release time...




Kees T
 

Looks very nice Nick, good luck with it.

You might also label the "+" via on the 5V input since we had some confusion there, and the other grounds (audio, etc).

73 Kees K5BCQ


Don, ND6T
 

Go for it, Nick! It seems that there are quite a few looking for some through-hole kits.
Don't forget, this circuit also works the same on BITX40s as well.
GL, - Don


Timothy Fidler
 

Bob I know these are non components boards  but I suspect they use the 7822 audio amp. THere was a bleat that some  Chino TDAs were failing. If so I know of two sources for NOS  replacements one out of Oz and one in USA. .. ad we are not talking crusty old Dan in Montana. Email  TEF if this is the case.

Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885, 
Telephone Whangarei   022  691 8405
e: Engstr@...



----- Original Message -----
From:
BITX20@groups.io

To:
<BITX20@groups.io>
Cc:

Sent:
Wed, 01 Aug 2018 18:35:40 -0700
Subject:
Re: [BITX20] ND6T AGC and Click kit wiring notes


I have 5 of the (VA3NOI)   ND6T AGC boards .  These are Through the Hole boards.

These are Free ---I  only ask that you e-mail me first as there are only five. Just need a self dressed stamped envelope after that.Stateside please.

Small amount so it's a single board only per request.

E-mail is----(W2HK) @arrl.net 

Also wanted to add how much I have enjoyed the Ubitx and the forum.

73's

-- Bob


Truffies
 

please send parts for 2 bds as I find 1 bd from someone

and I still will take your 2 kits wish all was from you so to work

th yu

Alan

-----Original Message-----
From: Kees T
Sent: Aug 1, 2018 9:48 PM
To: BITX20@groups.io
Subject: Re: [BITX20] ND6T AGC and Click kit wiring notes

Alan,

I was looking through my unbuilt uBITX kit and found two more AGC boards which I was using for "try for fit". So when your check/letter arrives, I can send you 2 AGC mini-kits. The total cost would be $5 which includes postage so I'll refund the rest. 

73 Kees K5BCQ

------------------------------------------------------------------------------------------------------------------

I today sent a check for 3 AGC mini kits $15 plus $5 for shipping
 
Alan Kessler WB2BQK
3222 South Dixie Hwy
Suite D
West Palm Beach, Fl 33405


Nick VK4PP
 

Thanks Kees, I hope Don ND6T is also OK....

So far I have this. The intention is to fit it next too my HPF on the ubitx... basically the same as yours Kees, just with components face up.
and TH also, and a pot for release time...


Kees T
 

Alan,

I was looking through my unbuilt uBITX kit and found two more AGC boards which I was using for "try for fit". So when your check/letter arrives, I can send you 2 AGC mini-kits. The total cost would be $5 which includes postage so I'll refund the rest. 

73 Kees K5BCQ

------------------------------------------------------------------------------------------------------------------

I today sent a check for 3 AGC mini kits $15 plus $5 for shipping
 
Alan Kessler WB2BQK
3222 South Dixie Hwy
Suite D
West Palm Beach, Fl 33405


Bob
 

I have 5 of the (VA3NOI)   ND6T AGC boards .  These are Through the Hole boards.

These are Free ---I  only ask that you e-mail me first as there are only five. Just need a self dressed stamped envelope after that.Stateside please.

Small amount so it's a single board only per request.

E-mail is----(W2HK) @arrl.net 

Also wanted to add how much I have enjoyed the Ubitx and the forum.

73's

-- Bob