Delta Pulse

[mohandes]

Delta Pulse, Automatic Mode, coil connected away from all metal.
Oscilloscope vertical sensitivity 10 mV per frame.
Photo
Signal in "D9 pin 11".
Signal in "D9 pin 2" .
Signal in "D10 pin 2".


Tensions in D7:
Pin 2, 58 mV
Pin 1, 5-10 mV negative.
Pin 7, 100-400 mV positive.


In my opinion, the integrator does not work or missing some or Tr5; Tr4 pulse, can be a key 4066.
luck
Jose[ATTACH]27481[/ATTACH][ATTACH]27482[/ATTACH][ATTACH]27483[/ATTACH]

thanks
i think manual mode better, and why all use auto mode ??
regards

[kt315]

I too have this problem with THE diodes.
As a solution I use alongside two other diodes with good results..
[ATTACH]27499[/ATTACH]

there must NOT be the problem with the diodes. something wrong you have. thinking SOURCE pin of IRF740 you connected to (-E) point instead of it must connect to
(-12V)= (-BATTERY).

[porkluvr]

tnx .... i fixed problem


dead 1N4148


Changed 1N4148 .. but after 30min burned down again :/


maybe can be replaced with a better diode?

Which one of the 1N4148 was it that burns? I assume that it was in the timer sub-circuit, but that still leaves two to consider.

[g.s]

I too have this problem with THE diodes.
As a solution I use alongside two other diodes with good results..

[aaksts86]

i have problem whit vd12 and vd13

Generally these diodes are burned during rehearsals, when we make a short circuit.
Disconnect the coil and measure the total consumption, the value should be 40 to 50 mA if all is well.
If burned during power up, the cause could be very high value capacitors C7 and C8.
Normal for C7 and C8 is 1000 and 10 mF.
Can utizar other diodes, but it is preferable to find the cause.
Jose

[kt315]

added some copper pour and cutout at SENS pot pads. check.

[Jose]

okyellow is D9-11 and blue is D7-2
[ATTACH]27480[/ATTACH][ATTACH]27479[/ATTACH]

please measure by multimeter D10 out put pins and D7-2,3,1,6,7 and put it here (when coil connected do this please )
regards

Edit : i have 10volts on 555-3 and it is dc voltage ( is line wave not square wave or..wave )
regards

Delta Pulse, Automatic Mode, coil connected away from all metal.
Oscilloscope vertical sensitivity 10 mV per frame.
Photo
Signal in "D9 pin 11".
Signal in "D9 pin 2" .
Signal in "D10 pin 2".


Tensions in D7:
Pin 2, 58 mV
Pin 1, 5-10 mV negative.
Pin 7, 100-400 mV positive.


In my opinion, the integrator does not work or missing some or Tr5; Tr4 pulse, can be a key 4066.
luck
Jose

[mohandes]

mohandes, send me a photo taken with the oscilloscope, the waveform at point "A" of the scheme, to compare with my DP. (ver.6 dp.JPG)

okyellow is D9-11 and blue is D7-2


please measure by multimeter D10 out put pins and D7-2,3,1,6,7 and put it here (when coil connected do this please )
regards

Edit : i have 10volts on 555-3 and it is dc voltage ( is line wave not square wave or..wave )
regards

[Jose]

tnx .... i fixed problem


dead 1N4148


Changed 1N4148 .. but after 30min burned down again :/


maybe can be replaced with a better diode?

Generally these diodes are burned during rehearsals, when we make a short circuit.
Disconnect the coil and measure the total consumption, the value should be 40 to 50 mA if all is well.
If burned during power up, the cause could be very high value capacitors C7 and C8.
Normal for C7 and C8 is 1000 and 10 mF.
Can utizar other diodes, but it is preferable to find the cause.
Jose

[aaksts86]

tnx .... i fixed problem


dead 1N4148


Changed 1N4148 .. but after 30min burned down again :/


maybe can be replaced with a better diode?

In the distance, we can only suggest possible solutions.
If we have no pulse TR2, obviously comprises the step and its associated circuitry 556, do not work.
This step will not work if lefalta feeding, which is the first thing to check, it often happens that for some reason opens one of the diodes D8 and D9, lacking the tension "-E".
Check the voltage on pin 7 and 14 of the 556 "-E" and nearby components.
Jose

[Jose]

thanks jose
but i need more help
regards

mohandes, send me a photo taken with the oscilloscope, the waveform at point "A" of the scheme, to compare with my DP. (ver.6 dp.JPG)

[g.s]

the my own Turns out gold deposit xa xa xa.......

[mohandes]

Mohandes,
To reduce the delay, is 1 nF C4, R7, 10 K. C6 can be reduced and the potentiometer "SENS" for better control of the second sample.
Tensions in D5 pin 1 and 7 alrrededor fluctuate from 0 Volts.
Same for D7 on pin 1 and 7.
When metal is close to the coil, the voltage at pin 1 of D7, increases towards negative. The voltage at pin 7 of D7, increases towards positive, more than 4 volts if the object is large.
In turn, the voltage at pin 7 of D8 (555) increases to over 3 volts negative.
regards

thanks jose
but i need more help
regards

[kt315]

kt315 YOU try the pcb YOUR .. works...and which are the results YOU..

3 metres depth 15cm x15cm gold plate, eah? or 5??...

[g.s]

kt315 YOU try the pcb YOUR .. works...and which are the results YOU..