Help HammerHead Please ....

[TheUnderTaker]

Hi every body...

I have some problem when combining my HamerHead Detector ...

The Problem is ...

when conecting the IC6 or IC7....

All the +5 V on the board go up to 9 V ....

I think the problem regarding to the voltage doubler IC1 ICL7660 ...

How to solve it ..?? Please Help me as fast as possible ....

[TheUnderTaker]

The Problem doesn't regard's to IC1

The Problem doesn't regard's to IC1. ICL7660.

Because I taken it off ... and still results the same..

R18 doesn't affect IC6 pin6 TP4.

but the good news that all ICs before IC6 tested ok ... and given all desired voltages.

and all the later ICs sockets gives the desired voltages ... but when apply any IC of them will affect the positive +5 volt jumped to 9 or 10 V on all the board.

Need Help Carl and Kat3 and any one can help please it is an emergency ....

Thanks in advance for all of your efforts for helping me.

[nick_f]

Hi every body...
I have some problem when combining my HamerHead Detector ...
The Problem is ...
when conecting the IC6 or IC7....
All the +5 V on the board go up to 9 V ....

Hi Undertaker,
IC6, IC7 can't cause the +5V to go to +9V.
If some components are defective, they will bring the voltages closer to zero, not increase them. Are you sure you know which connection is the ground? It is one and the same with the + of your 12V battery. Just check carefully you know where to measure, then go again over your board and check if there are any errors, shorted tracks, etc. Also check if you placed the components the proper way (for example IC2 and other regulators).

The +5V output is actually stabilized by IC2, to +5V. If IC2 doesn't work (maybe it has no connection to the ground), its output may get to +9V, as you say.

Regards,
Nicolae

[TheUnderTaker]

Thanks Nick for your concern...

I have check the board over 10 times.. all ok..

IC2 Gives +5..

but when installing IC6 or IC7 it jumped to +9 volts ... and when taking them off the +9 returns again to +5 ...

and I tried to install the IC6 without pin 2 and 3 and that solved the problem ..

so the problem is regarding to the pin 3 and 2 of IC6. But I didn't make that check on the IC7 pins to determine which pin made this problem.

my ground is the positive side as carl mentioned it his installing instructions ...

I follow his instructions word by word ...

but the volts still increase even after removing the IC2 at all...!!!

I appreciate your concern for my case thanks alot and hope to find out the problem if you can please .


Thanks and regards..

TheUnderTaker...

[nick_f]

Thanks Nick for your concern...

I have check the board over 10 times.. all ok..

IC2 Gives +5..

but when installing IC6 or IC7 it jumped to +9 volts ... and when taking them off the +9 returns again to +5 ...

and I tried to install the IC6 without pin 2 and 3 and that solved the problem ..

so the problem is regarding to the pin 3 and 2 of IC6. But I didn't make that check on the IC7 pins to determine which pin made this problem.

my ground is the positive side as carl mentioned it his installing instructions ...

I follow his instructions word by word ...

but the volts still increase even after removing the IC2 at all...!!!

TheUnderTaker...

Hi Undertaker,

If you remove IC2, you should NOT have any positive voltage on the +5V rail. I would expect 0V, or rather even some negative voltage, but not positive! The only way to get positive voltage on the +5V rail is via IC1, IC2. At the input of IC2 (pin 3), the voltage from the ground should be probably between +9...+12V.
Without IC6, IC7 in circuit (and with IC2 connected), can you please tell me what voltages do you measure for minus of the battery, for -5 and for -5D (digital)? Also, what voltage do you measure on Pin 3 of IC2? All in reference to the ground.

Regards,
Nicolae

[TheUnderTaker]

when I install IC2 as mentioned in instructions it produce +12 v on pin1. because pin 2 and pin3 taking positive Voltages . so I have turn it's pin 2 to the negative bar.

after this modification IC2 Pin1 produce +5 V.
and IC1 generate about +9 V.
and Negative ICs Generate -5 and -5D.

so I think the Important Question now why when putting the IC2 as mentioned by Carl Generate +12 as I mentioned. so I maked my own modification to link the IC2 pin2 to the Negative bar ... thin the +5 comes ok..

[TheUnderTaker]

and also to make sure I am mesuring right tell me where to put the negative voltmeter cable on the battery ?? on negative or positive ?? and should I mesaure with fixed voltmeter setup with batter>>?? or switshes voltmeter cables when check for positive or negative ?? so the voltmeter cables should stay stable without changes on battery side and measure negatives or posatives with one fixed mode on battery ..?? I hope you understand me.

[nick_f]

when I install IC2 as mentioned in instructions it produce +12 v on pin1. because pin 2 and pin3 taking positive Voltages . so I have turn it's pin 2 to the negative bar.

after this modification IC2 Pin1 produce +5 V.
and IC1 generate about +9 V.
and Negative ICs Generate -5 and -5D.

so I think the Important Question now why when putting the IC2 as mentioned by Carl Generate +12 as I mentioned. so I maked my own modification to link the IC2 pin2 to the Negative bar ... thin the +5 comes ok..

Hi Undertaker,
You are wrong. Pin 2 should be connected to the ground and if you measure pin 2 of IC2, it should indicate 0V. You have to understand that IC2 cannot "produce" 12V out of thin air. Do not try to modify a diagram that was tested probably by hundreds of people.
I am not interested in the measured voltages AFTER your modification. I try to find out why your circuit doesn't work properly when the circuit is built according to the instructions.
Please confirm that you are connecting the BLACK wire of your voltmeter to ground (= +12V of the battery) and RED wire to the output of IC2.
Pin 2 of IC2 should be connected to the Ground (same as +12V of your battery).


Regards,
Nicolae

[nick_f]

and also to make sure I am mesuring right tell me where to put the negative voltmeter cable on the battery ?? on negative or positive ?? and should I mesaure with fixed voltmeter setup with batter>>?? or switshes voltmeter cables when check for positive or negative ?? so the voltmeter cables should stay stable without changes on battery side and measure negatives or posatives with one fixed mode on battery ..?? I hope you understand me.

It depends what type of voltmeter you have. If you have a digital voltmeter that is able to measure both positive and negative voltages without changing the cables, then you always put the negative pin of the voltmeter to +12V of the battery.

If you have an older type of voltmeter (which cannot measure negative voltages), when you measure positive voltages (in this case, the +5V at the output of IC2 - that is pin 1), you put the minus of the voltmeter to Ground and plus of the voltmeter to pin 1 of IC2.

Also, if you want to be really sure that you have +5V at the output of IC2 and that you didn't make any errors during measurement, you can connect the negative of your voltmeter to -12V of the battery and the positive of your voltmeter to +5V. It should measure 17V. If your claims that you get +12V instead of +5V were true, this measurement should indicate +24V! But rest assured, you won't be able to read +24V...



Regards,
Nicolae

[Carl-NC]

Undertaker,

It sounds like you may have cooked IC6. Are you running the circuit with a coil connected to it? If so, that could explain how IC6 causes the rail to increase from +5 to +9.

Remove IC6 and check that your clamping diodes D3,D4 are working. If they are not, the the coil flyback will blow the (-) input on IC6.

- Carl

[nick_f]

Undertaker,

It sounds like you may have cooked IC6. Are you running the circuit with a coil connected to it? If so, that could explain how IC6 causes the rail to increase from +5 to +9.

Remove IC6 and check that your clamping diodes D3,D4 are working. If they are not, the the coil flyback will blow the (-) input on IC6.

- Carl

Nice logic, Carl. Probably you are right. Maybe he didn't install D3, or he put it backwards.

Regards,
Nicolae

[TheUnderTaker]

Thanks for all.. and still need Help.

Thanks Mr Carl and Nick...

no I didn't attach a coil during the test.

Mr. Carl I have a problem faced me after combining HammerHead detector the same problem faced me at Gary Detector..

The problem is that after complete combine the HammerHead detector and attach it to the battery found That:

the 79L05 has successful generate -5 V and -5D.

But the 78L05 doesn't generate the +5 V it is indicate 0V at the meter.

on the other hand ...

on the Gary Detector found the 79L05 has successful generate -5 V.

But the 78L05 doesn't generate the +5 V it is indicate 0V at the meter

so my Conclusion is :

the 79L05 doesn't generate the -5V on Gary Board because Gary Detector ground is Negative.

the 78L05 doesn't generate the +5V on HammerHead Board because HammerHead Detector ground is Positive.

the only solution for me is modify the schematic to let 78L05 take Negative in pin2 at HammerHead to successful generate the +5 but this will result in some Voltages errors when attach IC6 or IC7.

and doing the same thing in Gary Detector to let 79L05 take Positive.

So Please Help me I have Combine 3 Board of HammerHead with the same problem.

and also the same problem in Gary Detector but Differ in Parts only.

so please Help me at this point I have waste more of time and money for nothing but loosing.


thanks and regards..

The Under Taker.

[TheUnderTaker]

Don't Late.

Please Mr. Carl and Nick and any one can help...

help me as fast as possible please Because I am stopped at this point and cannot move forward ...\


because I need the Detector for my land to detect som important targets so please don't late in replay...

Thanks and Regards..

The UnderTaker

[nick_f]

But the 78L05 doesn't generate the +5 V it is indicate 0V at the meter.

Hi Undertaker

This is very different from your original statement. A few days ago you were complaining the voltage +5 gets too high.

First of all, lets clarify some things. A 78L05 doesn't "generate" a voltage. It only reduces a voltage which arrives at its input. The voltage at the input has to be at least 2...3V higher than expected voltage at the output. First, you should measure the voltage at the input and at the output of 78L05, WITHOUT IC6 and IC7.
If the voltage at the input of 78L05 is under 8 Volt (between pin 2 and pin 3 of IC2), it means IC1 doesn't oscillate. This could be caused by a number of problems. It is possible there is a shortcircuit on your board which overloads IC1. When this happens, IC1 doesn't oscillate anymore.
Also, it is possible one of the IC's is defective or installed the wrong way around (I refer to IC6, IC7, IC. It could also happen if C3, C4 have wrong values or are installed in reverse. If diodes D1, D2 are not installed correctly the voltage at pin 3 will also be wrong. Also, IC1 could be defective (or not a 7660)

Your first priority is to obtain over 8V accross the capacitor C4 (47uF). If you don't have good voltage there, remove IC2 and measure again.

Let us know the results.

the 79L05 doesn't generate the -5V on Gary Board because Gary Detector ground is Negative.

the 78L05 doesn't generate the +5V on HammerHead Board because HammerHead Detector ground is Positive.

the only solution for me is modify the schematic to let 78L05 take Negative in pin2 at HammerHead to successful generate the +5 but this will result in some Voltages errors when attach IC6 or IC7.

and doing the same thing in Gary Detector to let 79L05 take Positive.

Do NOT modify the schematics, because both should work. Try to identify your mistakes (most likely cause) or the components that got defective as a result of your previous mistakes.

You confuse the roles of 78L05 and of 7660 (or LT1054 in Gary's detector). These are the IC's that together with D1, D2, C3, C4 GENERATE positive voltage from negative voltage. 78L05 requires positive voltage at its input and pin 2 should be connected to ground.


Regards,
Nicolae

[TheUnderTaker]

Thanks for your reply Nick

Thanks alot...

ok to help me determine the problem...

just tell me where the 78L05 in hammerhead supposed to get the negative volt.

I mean what is it source exactly because when I measure volts found no any negative arrived to it.. all volts are either +v or 0v. for that reason that IC doesn't convert the volt into +5 V.

and the same thing in Gary Board where the 79L05 IC supposed to get Negative Volt from ...when I measure volts found no any positive arrived to it.. all volts are either -v or 0v. for that reason that IC doesn't convert the volt into -5 V.

if you help me in this point I think you will solve the entire problem.

just indicate that to me ... after that I will be able to determine the problem place.

also I was make HH power supply only without the rest of the board. and still appear the same problem .. the 78L05 doesn't convert to +5V.

That I mean the problem are in the power supply in either HH Detector or Gary Detector..


Thanks and Regards...

The UnderTaker.