Serbian "Most Wanted"

[mesy64]

Do everything according to pcb.You can use 33mf electrolite,and TL074,064 or 084 for LF347 ,and BD140 instead of BD180.

TANK YOU DEAR POMPEY

[mesy64]

Hello


I connected my circuit voltage SMW. Voltage output BD 140 a linear increase and the Speaker is burning.

MPSA13 transistor is a transistor DARLINGTON or a transistor negative normal??

I can not find the replacement for MPSA13 I BC877 instead of a transistor that DARLINGTON.

I output SMW problem because I use this transistor is?

Please help me

With respect

MESYNA

[Pompey]

Hello


I connected my circuit voltage SMW. Voltage output BD 140 a linear increase and the Speaker is burning.

MPSA13 transistor is a transistor DARLINGTON or a transistor negative normal??

I can not find the replacement for MPSA13 I BC877 instead of a transistor that DARLINGTON.

I output SMW problem because I use this transistor is?

Please help me

With respect

MESYNA

*************************
For MPSA13 use BC517 .See pins of tranzistors in www.datasheet.com

[mesy64]

*************************
For MPSA13 use BC517 .See pins of tranzistors in www.datasheet.com

TANK YOU
IS MY PROBLEM FROM BC877 TRANSISTORS????

[Ultimate_Haze]

Hi,
I cant see cap C28/10m electr./ on the last pcb.Shell I skip this?Or just missed?
Also there is spot around 358 labeled 5n?What is this for?
Thanks

[Pompey]

Do everything as is on pcb!Don`t look at schematic.Everything works.

[mesy64]

CAN I USE WIRE NUMBER 0.30 TO NUMBER0.20-0.27 IN RX COIL???

[Pompey]

CAN I USE WIRE NUMBER 0.30 TO NUMBER0.20-0.27 IN RX COIL???

From 0.22 to 0.30 - OK My last coil has 42w 0.56 for Tx and 155w 0.22mm for Rx.I didn`t try it yet.

[Ultimate_Haze]

Hello,
Just finish the last version.But it refuse to work.I cant measure - voltage.Also in RX part there is 4,4V?Maybe because oscillator don't work.For transistors I use MPSA14 but they have the same pins as MPSA13.Ah also couldnt find BD180 so I put BD140.But I doubt that this is the problem.
Have attach RH coil.
TX cap is 470n.Have try 570n.For RX its 68n made of 47n+22n.Instead 1M3 I used 1M2.
When I switch on/off can hear some sound.

[Ultimate_Haze]

I found my mistake BC547 that I use have ebc config.Havent check those.
Now its working.8,2khz.Buy sensitivity is poor.Detect one euro coin around 22cm.6cm diameter AL can from hand creme around 40cm.
What I can try to get better performance?

I have a question:how you wire musketeer coil?The cable is consisted of two separate wires which have their own shields.Right.Core to collector BC327 and shield to minus for TX and RX the same way?Or for TX /only/ core to minus and shield to collector?

[Pompey]

I found my mistake BC547 that I use have ebc config.Havent check those.
Now its working.8,2khz.Buy sensitivity is poor.Detect one euro coin around 22cm.6cm diameter AL can from hand creme around 40cm.
What I can try to get better performance?

I have a question:how you wire musketeer coil?The cable is consisted of two separate wires which have their own shields.Right.Core to collector BC327 and shield to minus for TX and RX the same way?Or for TX /only/ core to minus and shield to collector?

Tx shield to minus,Rx shield to ground.

[Pompey]

Uraa,my SMW finally works great. 1euro at about 34sm in air with discr. pot at 3/4,treshold and sensitivity -max.Frequency is 8.87khz.Power supply is 7810 -10volts.Tx amplitude is 20volts p-p.Ferrite -fully rejected,no cracks ,no instability at all.

[ivconic]

Uraa,my SMW finally works great. 1euro at about 34sm in air with discr. pot at 3/4,treshold and sensitivity -max.Frequency is 8.87khz.Power supply is 7810 -10volts.Tx amplitude is 20volts p-p.Ferrite -fully rejected,no cracks ,no instability at all.

[mesy64]

Hello


I built the circuit swm

But after all this metal detector does not work to. Output horn is weak when the shock coil would normally active in public it does not sound. 7.5kh frequency it is working. But changing the output voltage wire Screws Posts to Tghyyrnmy only Rkans changes will be little or much. I'll guess that the problem is pcb.

I use my bc547 instead of mpsa13 and tl074 instead lf347. However, must be implied, but work does not work.

Why my metal detector does not beep.

Please help me

With respect

mesyna

[Pompey]

Hello


I built the circuit swm

But after all this metal detector does not work to. Output horn is weak when the shock coil would normally active in public it does not sound. 7.5kh frequency it is working. But changing the output voltage wire Screws Posts to Tghyyrnmy only Rkans changes will be little or much. I'll guess that the problem is pcb.

I use my bc547 instead of mpsa13 and tl074 instead lf347. However, must be implied, but work does not work.

Why my metal detector does not beep.

Please help me

With respect

mesyna

MPSA13 is BC517