I built a metal detector on this page:
http://www.md4u.ru/vsm/VolksturmSSopt1(rus).gif
I have no sound.
On the output square wave my CD4024. Amplitude up to 10V. Frequency is 1648Hz.
If you plug in a short 11 pin CD4024 is the base of the transistor VT1 to hear the sound. However, as shorts pin 10 and 11 CD4066 is silence. The sound disappears across the diode VD2.
Do-10k resistor R47 must be specially selected?
The audio amplifier as I put VT1 BC547 and BC557 as VT2 --- whether they are appropriate?
Ask for suggestions ....
http://www.md4u.ru/vsm/VolksturmSSopt1(rus).gif
I have no sound.
On the output square wave my CD4024. Amplitude up to 10V. Frequency is 1648Hz.
If you plug in a short 11 pin CD4024 is the base of the transistor VT1 to hear the sound. However, as shorts pin 10 and 11 CD4066 is silence. The sound disappears across the diode VD2.
Do-10k resistor R47 must be specially selected?
The audio amplifier as I put VT1 BC547 and BC557 as VT2 --- whether they are appropriate?
Ask for suggestions ....
Comment