'KROT2-XM' (mole), new project Xmega32

[WM6]

This happen with last HEX only or with some older HEX too?

[Wiltran]

This happens with every hex Ive tried 8, 9, 10 and 11. ferrite balance works, all features work, detector functions well except random beeping. I remember while building the eduardo VDI board, the amp would overload and the detector would randomly beep until I decreased a resistor. but on this one the gain is adjustable through firmware.Beeping stops when I disconnect coil. I am using two separately shielded pairs for coil, both connected only at RX ground. I wonder if anyone else who has built this single sided Dip board has solved this problem. Any ideas?

[ANDREW K2]

Random beeping may be e.g.
1. If you are at home, where a large amount of noise.
2. Poor ekrannirovany PX chain. Even need to shield connector.
3. have been set for a little over a large gain, or small rapids.
There may be other reasons .. All this can be verified by turning off the coil Random beeping should abyss at the threshold of S44!

[WM6]

2. Poor ekrannirovany PX chain.

Mean: Poor shielded RX front end (connector inclusive and RX line till PCB - use shielded RX wire between board and connector too).

[smity]

Most likely, the reason screening, connection, or cable. What cable do you use?

[gurdal]

http://youtu.be/wx6Ja-enAxw

[ANDREW K2]

Why thresholds 36 you are going to dig iron?
The "0" is not necessary so often reap ...

[smity]

If the "noise" in the printed circuit board DIP, the author recommends that these changes ... I recommend r18 is replaced by 30-100 mH choke, Dr1 not put more than 30 mH or jumper. C28 = 10uF (in the list 1 uF) and if it is a capacitor film, still put in parallel ceramic 0.1 uF! More ... Connector coil connected to the cable shield and soldered to the "cold end" PX.

[WM6]

... Dr1 not put more than 30 mH or jumper.

You mean 30uH? MicroHenri not MiliHenri?

30mH cannot be comparable to jumper inductance.

[smity]

MicroHenri

[Wiltran]

DR1 =L1?

[WM6]

DR1 =L1?

Yes, Choke 1. Choke = drosselj (дроссель - Russian ) = Drossel (German) = abbr.: DR

[Wiltran]

Thanks WM6, I think others are having this chattering problem with the Krot2 DIP. I hope the beeping will stop after I make the changes.

[WM6]

Hi Wiltran, can you take some video of those chattering including clear wisible display during chattering. Maybe Andrew can then help you more.

[Wiltran]

Chattering

I replaced R18 with 92 uh choke, Dr1 is 10 uh choke, C28 replaced with 10 MFD electrolytic. cable shield connected to RX ground. After suggested changes made, no change- still chattering/ beeping! Detector functions well otherwise, good visual discrimination, and depth. Disconnect coil and beeping stops. I couldnt find a 300 pf for C19 so I used a 330 pf. maybe change R12 from 100K to ?
I wound a new DD coil, 1.063 mh TX, 8.5 KHZ C1 .3 mfd., 23.5 mh RX 7 khz C0 .022 mfd.