开云体育

I have added audio AGC to my uBITx, its a kit board from Walford Electronics (G3PCJ).
Disconnected the yellow wire from the top of the Volume pot. Yellow wire to the input of the AGC board via a 10 K resistor.
Output to the top of the Volume pot. Removed R235 and connected top of C252, to top of the Volume pot via 1 K resistor and 0.1 microfarad in series? (Cap stops? DC on the input of the audio amp )
This now puts the CW side tone in after the AGC board.

I also replaced the TDA2822M with a LM380-8 will need a bit of jiggling with the pin connections. hint turn it upside down.
The LM380-8 will work from 10 to 18 volts, and has built in thermal protection.

I checked into this AGC but it's pretty expensive to ship to the US - the dollar equivalent of??25.

Has anyone found anything similar here in the US? I can build one from scratch but I would prefer one nicely made up on a PCB.
Howard K4LXY

?

Is there a schematic for this? AGC ? .. I've not been able to find one so far .

No.
Its copyrighted
Philip

There must be a diagram or schematic somewhere or it wouldn't be able to he built , Would be good to see it , Get some ideas , Improve on it , Tailor it for the bitx ..

Try searching Google images for audio AGC.

How about this? (designed for the BITX40)

I use the NE570 IC for my AGC ...??

Do you mean R253?
Howard?