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

[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]

yes, do next. solder voltage indicator part.

[chuubaba]

Again i changed NE555 and now it is working. I dont want to test again because i fear burning the chip. Should i move to next step or diagnose what's causing the chip to burn. Resistor attached with coil wire is 10k.

[kt315]

1. check +12 on board
2. check wire with resistor
3. check speaker

[chuubaba]

I changed NE555. There was a small noise from speaker and then silence. I am using 12v power supply. Again it's not making sound.

[kt315]

good. you got a sound. try change NE555. do not use TLS555 and other JFETs timers.

[chuubaba]

I tested the board. It made sound same as in your video. I test a few times but suddenly it makes no more sound.

[chuubaba]

Is there a discrimination module for DP REV5 ?

[kt315]

rerun in especcially created by me thread https://www.geotech1.com/forums/show...ash-technology

[kt315]

C8 C9 C11 C19 C20 C23 C24
C14 C15

do not buy nothing. use components from trash boards. seek around old CRT vga svga monitors, tv, etc and take it.
all my projects use just trash technology, taking into account on poorest layers of people.

[chuubaba]

use this type caps on power lines. C8.... C9 ... C19.... C24 etc.

https://www.aliexpress.com/item/32871131247.html?spm=a2g0o.detail.1000014.47.23a930839J48F3&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.128125.0&scm_id=1007.13338.128125.0&scm-url=1007.13338.128125.0&pvid=4e8381b5-000c-446d-921b-9d08f154c746

do not use big size caps.

Ok i will use %0v Ceramic capacitors for C8, C9, C19, C24.
Which other capacitors are located on power line ?

[kt315]

use this type caps on power lines. C8.... C9 ... C19.... C24 etc.

https://www.aliexpress.com/item/32871131247.html?spm=a2g0o.detail.1000014.47.23a930839J48F3&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.128125.0&scm_id=1007.13338.128125.0&scm-url=1007.13338.128125.0&pvid=4e8381b5-000c-446d-921b-9d08f154c746

do not use big size caps.

[chuubaba]

OK. Thank you for so much information.

learn this pics

[chuubaba]

So there is no harm if i use 250v polyester capacitors?

[kt315]

learn these pics