Barracuda Legend Kit Problems

[Impulse]

hey old cart i have a new soldering station (temp control) and i have taken off the 330ohm balance resistor off and it is fine?

[Old cart]

i had one of these

http://www.ebay.co.uk/itm/Plastic-Shell-27mm-32-Ohm-0-25W-External-Magnet-Speaker-Horn-Loudspeaker-Green-/291644648042?hash=item43e7602a6a:g:3PYAAOSwhkRWeaTj

it worked to get the board going but was junk after that so i started using the buzzer which was better.

What headphones do you suggest guys? as this is ultimately the route i want to take so if i buy some i would like to buy a 'good starter set/high impedance headphone set) which will also help with the barracuda build (difficult to get 'a' single 'best' i know) or just a speaker that you guys used/bought, where did ya get it? (32 ohm).

Maybe something like this

http://www.parts-express.com/visaton-k50wp-16-2-full-range-water-resistant-speaker-16-ohm--292-540

These are Chinese, you should be able to get them in UK.

[Old cart]

You did unsolder the damping resistor first ?

6666 is right- the damping resistor is in parallel with the coil. Resistors in parallel add like this
Parallel resistance 1/ (1/Rcoil+1/Rdamping)
for a 2.1 ohm coil that equals 1/(1/2.1+1/330)=2.08ohms
conclusion you must unsolder to measure it. Note it could also be open and that would cause the waveform you see. it will also measure about the same 2.1 ohms.

[6666]

ok i have measured the damping resistor and i get 2.1ohm (AH!!!!) i will replace it once i get a new soldering iron as my last one no longer functions as it should (should be tomorrow)

is this one ok ? https://www.machinemart.co.uk/p/drap...ering-station/

You did unsolder the damping resistor first ?

[Old cart]

yer that one says it is temp controlled? and i get 0.1 ohm if the leads are pressed together. ok will look at the solder joints for bridges. I have had a look and my meter has the delta function (RELTRI) button.

Yes ideally. However if you are not planning on doing more electronics the cheaper model, or something similiar will do.
.1 is great and if you have delta you can use it too.

[Impulse]

yer that one says it is temp controlled? and i get 0.1 ohm if the leads are pressed together. ok will look at the solder joints for bridges. I have had a look and my meter has the delta function (RELTRI) button.

[Old cart]

That will work, if you can swing a temp controlled one that is even better. Something like this

http://www.dalco.com/p-11113-stahl-tools-ssvt-variable-temperature-soldering-station.aspx?gclid=Cj0KEQiAu9q2BRDq3MDbvOL1yaYBEiQAD6qoBoYuyFVPcHLn3SpPuWslxCLZ-D_jNDnxNdPNff-mW3YaAjxW8P8HAQ

Check for solder bridges around the damping resistor tracks. When they fail they do not usually fails as a short. To test you meter just touch the leads firmly together in the ohms mode. It should read very close to 0 ohms.If is reads like .7 ohms many meters have a Delta (may show as a triangle) button that allows you to take the current reading and make that 0. if it reads much high than .7 the lead may need work. Note that this only matters when you are measuring low resistances but it is a good habit to get into to check it before testing.

[Impulse]

ok i have measured the damping resistor and i get 2.1ohm (AH!!!!) i will replace it once i get a new soldering iron as my last one no longer functions as it should (should be tomorrow)

is this one ok ? https://www.machinemart.co.uk/p/drap...ering-station/

[Old cart]

Old cart thank you, and out of curiosity i had a look at pin6 of the 5534 and this is what i got since playing with the soldering.

here [ATTACH]35382[/ATTACH]

This looks like the damping resistor has either burned up or become unsoldered.:<(

Looks like you also went back to using x1-GOOD SHOW, you are learning! I thought the x10 was causing loading problems. It was not and making the signal smaller only succeeded in adding more noise.

[Old cart]

Impulse those look good. It would not hurt to charge the battery.

[Impulse]

ahhhh i c sorry! ok 5.067v78l05 5.020v79l05 batt 11.45v

[Old cart]

6666, ok i will clean as best i can i have some rosin solvant i use

i have put CH1 and 2 on the output of 78l05 and 79l05 and this is what i got ?

here [ATTACH]35383[/ATTACH]

Actually I meant MULTIMETER.

[Impulse]

6666, ok i will clean as best i can i have some rosin solvant i use

i have put CH1 and 2 on the output of 78l05 and 79l05 and this is what i got ?

here

[6666]

Impulse, after having a look at the copper side of your pcb, the first thing I would be doing is cleaning the flux off
by useing a soft brush and denatured alcohol, IE methylated spirits let dry and clean again any remaining residue, a clean pcb is a happy pcb
thick flux can sometimes do strange things on PI's

[Impulse]

Old cart thank you, and out of curiosity i had a look at pin6 of the 5534 and this is what i got since playing with the soldering.

here