For sale bare boards for Delta Pulse/Sniffer XR-71

[kt315]

yes, do next. solder voltage indicator part.

[kt315]

or diagnose what's causing the chip to burn.]
---
whats cause the chip to burn... you had learn hard lesson. no need to diagnose the cause.
ON YOUR BODY elementary accumulate electro-static field charge, UNVISIBLE charge. you go in your room, charge increases.
then you take naked wire with resistor... vu ala... charge discharged in way - your body ->
->wire-> electronics.

main rule from that. at first you must touch the GND potencial everywhere on pcb, then you can
follow your work.

[kt315]

[kt315]

[chuubaba]

This lesson about electrostatic i will not forget.
What components make the voltage indicator part? Any pictures or videos?

[kt315]

[chuubaba]

Can i remove the killer resistor or it is required for further tests?

[kt315]

yes remove the wire with resistor.

[chuubaba]

I should wear plastic gloves before testing sound.

Is this the voltage regulator part?

[kt315]

not. this

[chuubaba]

Ok. I have completed power regulator as shown in your picture. How to test this?

[kt315]

turn on your power supply and change voltage from 11 to 12V. you must see how red color changes on green.

[chuubaba]

Do I need to install NE555 for this test?

[chuubaba]

The red LED is ON after voltage drops below 11.75V.

I performed this test without installing NE555 and loudspeaker.

[chuubaba]

What is next step to build?