BARACUDA-Legend-1

[Wilson]

I use gel battery 12volts 1.3 amperes, the battery that you are using will not endure for long, you can use 8 AA rechargeable 1.2 volt batteries mounted in a door, totaling 9,6 volts.
The output for the coil is pulsed frequency around 650Hzs, the ideal would be to use an oscilloscope, you have verified that it has -5volts +5 volts?

[satdaveuk]

Hi Antonio
The opium voltage the Barracuda is and was designed to work on is 9.6V
It Had eight 1.2v rechargeable battery's wired in series two banks of four.
The barracuda works fine on 9V but not much below, so providing your battery is in A1 condition it should be working.
Before getting to Involved with in depth fault finding check your voltage on supply in to your PCB because it may be simple as you have broken lead on your battery clip.
After that check voltages going in and out of the 7760 , If there ok get your circuit together with your PCB layout file and do continuity checks with your meter starting with supply lines and ending with return lines checking correct component placements as you go taking particular attention to your diodes and transistors polarity ( CHECK MANUFACTURES PINOUTS).
More than likely its going to be a easily made man made fault so check and double check your construction first before pulling suspected components otherwise your liable to create more problems for later on .
Regards

[Wilson]

I made a mistake in describing 8 rechargeable batteries full 12volts, I was thinking about 1.5 volt alkaline batteries and not rechargeable 1.2 volt. Our friend satdaveuk is correct, I already corrected the error, sorry.: Good

[antonioknight]

i get a speaker on ne 9 volt battery i get off the Q5 and no voltage output where there is out for coil either in 7660 nothing only mvolts what i get where i should take +5 -5 volt wilson? tomorow wilson i will get the battery you have 12 volt 1.3 amps.any advise men please .thanks

[satdaveuk]

Hi Wilson
We all make mistakes, trouble is on here if you don't notice them within a short time period or before someone else has posted after you your knacked because far as I know theres no way of changing it after that.
On another note was looking at your changing the 5V- to 12V- on Q5 which is interesting because we all seem to end up back there.
What baffles me is my build was to original specs on the original hand drawn circuit and parts list and although my machine works as good if not better than others builds its a non motion machine full stop where as it seems everyone else's is motion.
Have talked to three people that actually own manufactured Anchor Barracudas and they all state categorically that there machines are non motion.
So my question is .... am the only one with a non motion self built Barracuda?
2nd Question is there anyone apart from me here who has built to precisely the hand drawn circuit and component spec sheet that was originally posted ?.
I noticed Wilson on your video with the pinpoint mod it greatly reduces range, where as I'm getting round about the 4-5" with a 2" coil in real conditions, 10" coil using wire out of a car coil looking at around 10-12" old copper penny coin again in real conditions and all this is non motion.
When time permits will dig it out and do some more playing because Ive not even spent time with a scope on it so there must be more there unless I just hit lucky.
All the best

[antonioknight]

People who built barra HELP ME!!!

[satdaveuk]

[ATTACH]25107[/ATTACH] i get a speaker on ne 9 volt battery i get off the Q5 and no voltage output where there is out for coil either in 7660 nothing only mvolts what i get where i should take +5 -5 volt wilson? tomorow wilson i will get the battery you have 12 volt 1.3 amps.any advise men please .thanks

Hi
If you got a full 9V going into the 7760 and only millivolts coming out you have a short so don't put that 12V 1.3AMP battery on otherwise you will do allot of damage, stick with the 9V at least till you get it going correctly.
1st pull all chips out apart from the 7760 and tell us what readings you have on the 7760 because by doing that you have isolated allot of the build and less chance of further damage.

Its more than probable that the 7760 is knacked now anyway , what you need to do is find out why?

[Wilson]

Hello Antonio, with the battery connected to the circuit check the voltage at the battery terminals and tell us the value.

[sinclairuser]

Hi dave, saw your post and thought id update you my complete barra as per, as original as possible, out in the field it is indeed non motion, it works well but, its very sensitive to all spectrum "mush" in that, any large emission source gives it a strange pseudo "motion" attitude, if that makes any sense.
Q5 in this original configuration as per schematic, i think is better served with a bf245 type (thanks wilson) there are not many different alternatives here, as the bipolar two pin (g-d)and s application is whats being used here and more importantly its voltage across source-gate.
Try this experiment thresh 2, delay 0(most important the front panel pot must be 0ohms when pot is fully off ), attach probes to the pins of q5, then power up all you have to do is watch what happens when the detector is running and you turn the delay pot, ie <0 ohms the voltages change, but dont change again the more the delay pot is turned i reckon its some kind of delay stabalisation method.
The transistor is on when delay pot(remote) is on, returning it to 0 it too is off.
just an idea, my complete barra will not be opened again unless it stops of course, as it is exellent on the beach which is what i wanted in the first place, the silver dog kit is on my bench with a bf 245 in q5, and its more stable than the other was, the silverdog one has the irf fet instead of (tip 127(thanks chris)), as for the reported audio difference between the two i just cant tell but it does 10" on the east yorkshire beaches so its a winner!(1972 2 pence piece almost flat in the sand)
aly

[antonioknight]

I replace today the battery with 12volt 1,3 ah and the 7660 get heat I get pin1 5,65 volt pin2 3,5 volt pin3 14mvolt pin4 -o.94 volt pin5 -3.14volt pin6 7.8 volt pin7 9.53 volt pin8 12.05 volt

[antonioknight]

Wilson the battery stays 12volt

[Wilson]

Hello Antonio, this is the 7660 warming a possible short circuit in the tracks, pads or CIS, you should build the barracuda with sockets in the CIS, this would facilitate the tests.
Disconnect and check for possible short circuit on the side of the welds, photo "macro" both sides of the plate with the best possible quality and mostrenos the forum.
Are you using the IC ICL7660 SCPAZ, already discussed this subject in the forum, it supports 13volts check.

[sinclairuser]

the standard 7660 cant handle 12v it should be no higher than 11.2 or your just creating heat.
if you must use 12v you need the irf fet and 7660a or 7660 sc but even then its just wasted power imho the barracuda was intended to run at 9.6v 8x1.2 AA rechargeable you can use six AA 1.5v high power alkaline giving 9v(thats what i did and it runs fine dont rate rechargeables in detectors that take separate aa cells).
pp3 9v batts just dont work well in fact the difference between 2x 9v pp3(9v config) and 6x 1.5 duracell extra were worlds apart in my own tests so i went that route irf fet and 7660a/sc is definatley the way to go as that has the most flexable power range 9v-13v.

[antonioknight]

the standard 7660 cant handle 12v it should be no higher than 11.2 or your just creating heat.
if you must use 12v you need the irf fet and 7660a or 7660 sc but even then its just wasted power imho the barracuda was intended to run at 9.6v 8x1.2 AA rechargeable you can use six AA 1.5v high power alkaline giving 9v(thats what i did and it runs fine dont rate rechargeables in detectors that take separate aa cells).
pp3 9v batts just dont work well in fact the difference between 2x 9v pp3(9v config) and 6x 1.5 duracell extra were worlds apart in my own tests so i went that route irf fet and 7660a/sc is definatley the way to go as that has the most flexable power range 9v-13v.

I use the 7660a-cpaz what about it;iget heat i double check the tracks no circuit

[Wilson]

Antonio, try replacing the CI 40106 and if possible install a socket, if the voltage of +5 volts and-5volts not normalize remove the IC NE5534 and check the voltages without it, repeat the procedure also for the IC LF412.
NOTE: Each IC socket install removed to facilitate testing and replacements.
If these steps do not resolve it is possible that the ICL7660 IC is damaged.