DP: Please help please.

[aurum]

Can you help me please? My knowledge of Electronics is very limited.
I finished connecting a Pulse delta, but when I connected it for the first time, it worked half second (sound in speaker + led...) and then nothing, only the blue led continues to light.
Lead Acid Battery 12v 2.2Ah (After Checking: v = 13volts Amperage: ???)
Coil 40 x 40 cm, 4,5 ohm
Thank you
Aurum

[kt315]

8. Set pots in pre-set position:

- DEPTH – min, at left side, counter-clockwise
- DISC – min, at left, counter-clockwise
- GEB – middle
- SENS – middle
- T/HOLD – middle

do not rotate the pots - that is making nothing now.


desolder C30 from back side of board. turn on the pcb with coil. you will hear all continius sound - from high pitch to still low and low.
then it will stop.
or, push knob RESET. you will fast go in normal mode.
two LEDS is a Voltage Indicator. if voltage level more/equal 12V green LED is lighten. if voltage level less 11.5-11.6V red LED is lighten.
you can move the level changing R52.

[kt315]

bottom side mirrored

[kt315]

post N56. voltage indicator was taken from this site.
https://www.head-fi.org/threads/low-...s.82115/page-4

[kt315]

a sound on turn on and i push RESET

https://www.youtube.com/watch?v=3yZuOn4bc6o

[aurum]

Thank you KT.
I will do this and see the results.

[aurum]

KT Thanks for your reply but,

I have desolder C30 and no result, no sound only the green led.

Have take some mesures here:

+E-GND 5.71
T1 5.71
T2 0
T3 11.42
T4 11.42
T5 11.42
T6 6.02
T7 6.33
-12V 12.76

GND-T1 0
T2 5.68
T3 -5.69
T4 -5.71
T5 -5.71
T6 -0.33
T7 0.50

-E -T1 5.70
T2 11.40
T3 0
T4 0
T5 0
T6 5.37
T7 6.14

-12V-T1 7.02
T2 12.70
T3 1.33
T4 1.33
T5 1.33
T6 6.69
T7 7.42

[kt315]

do those connections and you have to hear the sound.

[aurum]

If I understood correctly, I have do desolder those 2 componants P5 and T9?

[aurum]

Excuse: typing error: "to desolder" and not "do desolder"

[kt315]

desolder VT9 and connect a resistor from +V on 7 pin of NE555.

[aurum]

I did all that, but I didn’t get any result.
It is as if the coil was not connected. However, I checked it and I also used another coil: the same result.
I am desperate.

[kt315]

i did repair and there was fake chinese LF357 with no signal on output. with it the sound was absent. try set something different, TL081, LF356 etc.

[kt315]

also, please learn that you can NOT measure an impulse signal by a tester. a tester shows you NOTHING.
https://www.dummies.com/programming/...ating-current/

RMS voltage: The average voltage of the circuit; also called the mean voltage. RMS stands for root mean square, but that’s important only if you’re studying for an exam or something. RMS voltage is far and away the most common way to specify the voltage of an AC circuit.For example, when we say that the voltage at a household electrical outlet is 120 VAC, what we really mean is that the RMS voltage is 120 V.
If the AC voltage follows a true sine wave, the RMS voltage is equal to 0.707 times the peak voltage. Or to turn it around, the peak voltage is equal to about 1.4 times the RMS voltage. Thus, the actual peak voltage at a household electrical outlet is about 168 V.

you can measure by tester ONLY CLEAR SINUSOIDAL voltage.

[aurum]

Hello kt,
I changed the ics, but no results.