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Offline Homefire
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« Reply #150 on: January 25, 2010, 07:19:30 pm »
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Just to Muddy the waters, the optimum audio freq is just a slow click.

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« Reply #151 on: January 26, 2010, 01:13:58 am »
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Thanks Homfire

But that dose not muddy the waters it helps  Smiley

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Offline Peti80
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« Reply #152 on: January 26, 2010, 02:53:50 am »
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Ali, can you do a reading on the regulators input pins? Just to be 100% sure, that they receive the right voltages. Watch for polarity, earlier you wrote -9.8V out of the 7812, which should be a positive voltage. Maybe you connected the multimeter in reverse, weren't you?
Since it was working for Cornelius, there shouldn't be a big trouble.

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« Reply #153 on: January 26, 2010, 04:07:43 am »
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Hi Peti80

I totally agree with you there should be something very stupid that I have over looked do you have the schematics it was posted here I think that it was on page 9 or 10 if you down load it you will see that the battery has -10.5v and 0v so that would mean that pos is ground and I thought that's where the problem lies with his measurements. Now we have to remember that T1 was removed two 9v batteries are used meaning that there should be 0v on ground -9v at the 78L05 and if I?m right + 9v on the 78L12 I don?t quite see it any other way. Unless 0v is actually +18v I think that I?m talking #@#$@ at the moment. Aliman is C6 in the circuit?



Aliman I think that I have it this time there is a diode on the board it has a marking +12v you must solder the pos to it on the other side of the board there is -12 there you connect the neg now there where the connection of the two batteries is in other words the wire connecting the two batteries together that is 0v it must go to 0v on the board that should do the trick (well I truly hope so) Grin

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Offline alimanTopic starter
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« Reply #154 on: January 26, 2010, 09:08:04 am »
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Xavier, when I check the Inputs on the regulators, should my positive test lead be on the Input or Ground. I"m not sure if I had the Multimeter hooked up correctly.
Sorry Xavier, for the beginner questions.
Aliman


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« Reply #155 on: January 26, 2010, 09:13:35 am »
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Ground!    Great

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« Reply #156 on: January 26, 2010, 09:42:51 am »
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Yes but check on the PCB if you have 18v between the -12v and the +12 if not you have a short (you should have 18v or there about as you are using two 9v batteries in series) if you do have the 18v then there is no short and you should have your +12v and -5v or there about as you will have a voltage drop in the regulators. also check -12 and ground you should have 9v then +12 and ground also 9v

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« Reply #157 on: January 26, 2010, 10:11:57 am »
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OK, the 78L12(pos) regulator , on the Input there is  -9.8 v, on the Output there is +8.94 v.
 The  79L05(neg) regulator , on the Input there is +7.97 v, on the Output there is -2.27 v.
 Thats the numbers for the regulators.
  Xavier, yes there is  +18.6 v between the -12 and the +12.  Also between -12v to 0v there is - 9.2v and between +12v to 0v there is +9.3v.
 I hope these reading make sense.
Aliman

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« Reply #158 on: January 26, 2010, 10:47:57 am »
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Looks strange. Are you sure that you measured the voltages with the right polarity? The input polarity must be the same as the output polarity for the given regulator. They cannot "reverse" the polarity. Do you have the black lead on the COM connector of the multimeter, and the red lead on the (V, mA, ..) connector? If not, please make it like this. And if you did so, please do not randomly change the leads while measuring. Keep the black one on the ground pin of the regulator, and put the red to the inputs and outputs.

The input and output of 7812 should be positive in respect to the ground pin of the regulator, and negative for the 7905. Can you make sure, that the polarities you mentioned are correct?

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« Reply #159 on: January 26, 2010, 10:56:13 am »
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Good now we are getting some where but I don't like the voltage that you are getting on the 79L05 you must have   --5 volts as for the 78L12 if you turn you voltmeter prongs around you will have +12v have a look if there is not a short between common and one of the tracks on the PCB all so if you place you volt meter on the 79L05 then turn VR1 it could be that you are drawing to much currant there but I?m not sure any how you can try and see if your voltage goes up if it dose try and get it as close to the -5 volt then try to adjust the control knob to see if your audio comes to a very slow clicking sound.

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