pi preamp

[liudengyuan]

Yes, I would like to use electronic devices, ultrasonic or sub-wave to attract fish, but I do not know what the wave of fish on what, the frequency of interest

[Orbit]

Yes, I would like to use electronic devices, ultrasonic or sub-wave to attract fish, but I do not know what the wave of fish on what, the frequency of interest

http://www.elektronikanikolic.com/el...IIHG9dqSmtj0Xc


The generator can be with 555 and outputs a beep via piezo for the sound signal can be melted via the potentiometer and adjust the sound for the appropriate fish and the piezo is inserted into a ball formed from a two-component resin and is thrown into the water goes from one oscillator to a simple amplifier to amplify the sound.
I have a complete scheme somewhere but i need to look for it....

[liudengyuan]

http://www.elektronikanikolic.com/el...IIHG9dqSmtj0Xc

[ATTACH]49451[/ATTACH]
The generator can be with 555 and outputs a beep via piezo for the sound signal can be melted via the potentiometer and adjust the sound for the appropriate fish and the piezo is inserted into a ball formed from a two-component resin and is thrown into the water goes from one oscillator to a simple amplifier to amplify the sound.
I have a complete scheme somewhere but i need to look for it....

Hello, can you help me find the circuit diagram and the specific production method, thank you very much

[Qiaozhi]

Hello, can you help me find the circuit diagram and the specific production method, thank you very much

https://www.facebook.com/43757273308...NtlTiMy1aFEHgP

[liudengyuan]

https://www.facebook.com/43757273308...NtlTiMy1aFEHgP

Cannot open web page

[Qiaozhi]

Cannot open web page

You need to have a Facebook account to see it.

[liudengyuan]

You need to have a Facebook account to see it.

help me

[kt315]

You need to have a Facebook account to see it.

i see unregistered. i think facebook is banned in his country.

[Qiaozhi]

help me

i see unregistered. i think facebook is banned in his country.

Try using a VPN.

[liudengyuan]

Try using a VPN.

Cannot access other websites due to network restrictions, please help find the circuit

[ivconic]

Try using a VPN.

Epic privacy browser...

[Orbit]

A very effective way of eliminating overhead power line noise is to use a differential coil arrangement as in the picture. Lower coil is mono TX and RX. Upper coil is identical, damped the same, and is for noise pickup. It is fed into the opposing input on the preamp and cancels the noise picked up by the lower coil. The other method is a figure of 8 type coil, but the response is more complicated.

Eric.
[ATTACH]49421[/ATTACH]

Hello Mr Ferric!
Whether a monopolar or bipolar transmitter is used here ? Or is the upper coil connected to the gnd on one side and directly to the other amplifier input on the other ?

[liudengyuan]

Can anyone help me find the circuit and principle of tempting fish, thank you very much

[kt315]

look a video with me. subscribe on his channel. you will know all about fishing. https://www.youtube.com/watch?v=ZnwEdr1M6d4

[liudengyuan]

I do n?t want to fish, I want to use electronic devices to attract fish, I need a circuit like this, I ca n?t view the video