[Electronic Eavesdropping Devices Detector]

hi audioguru
i am reducing value of R6  but i dont get good result. dont change it.
do u thing in my circuit any component was damage?

[dancing leds with counter]

hi every body
i need 2 deferent circuit :
1. convertor :9v battery converting to 3v for LED very simple.
2. very simple soundmeter for 4 or 5 or 6 LED with 9v power supply.
do u have anybody these circuits?

[Electronic Eavesdropping Devices Detector]

hello audioguru
thank you for your help to me.
but not have result up to now because my circuit have alarm continously.
please check it :
collector  BFR90 : 2.91v
IC :
pin1 :1.29v
pin7: 1.93v
pin8 : 1.65v
pin14 : 2.04v
R6: 1.1M
and with C2: 4.7
P1:volume  5k
antena: 50cm wire
and pin2 of LS connecting to +9v because in pcb not have this connect but in schematic diagram connected.
for pin1 that have 1mv what can i do ?

thanks for all and all the best

[Electronic Eavesdropping Devices Detector]

hello audioguru
folowing ur question about collector and output of op-amp :
tr1 collector : 3.9v
op-amp: pin1: 5v pin7: 0.3v pin8: 0.3v and pin14: 7v
what sall i do ?

[Transmitter for students]

hello muhammad faraz
for this system that must be unique which is not accessible to every one who is searching the net u need to progrmming assembly with microcomputer for example PIC and u should encoding ur data or wave that u can send it.
good luck

[Electronic Eavesdropping Devices Detector]

hello
I am new user in ur forum I am very enjoy but many years ago reading ur information in any forum specially "audioguru" hello audioguru.
I am make pcb eavesdropping device detector but not work no sound. i am testing all component but dont listening any sound of buzzer.
no short circuit  what can i do ???????????????????????????