Lrl from Italy

[Babak Ruby]

[ QUOTE = FrancoItaly؛ 162220 ] [/QUOTE

Is Can we remove the oscillator from the circuit with a switch and control the zero volt border in different areas with a digital display?

[FrancoItaly]

[ QUOTE = FrancoItaly؛ 162220 ] [/QUOTE

Is Can we remove the oscillator from the circuit with a switch and control the zero volt border in different areas with a digital display?

If you unplug the oscillator the lrl doesn't work, the sensor stage amplifies the oscillator signal and the phenomenon somehow interacts with it in mixer TR2.

[Babak Ruby]

If you unplug the oscillator the lrl doesn't work, the sensor stage amplifies the oscillator signal and the phenomenon somehow interacts with it in mixer TR2.

What I mean is to put a switch after the oscillator so that before exploring, we can set the zero volt limit of the sensor output in different geographical areas with a voltmeter, then put the oscillator in the circuit to explore, please.

[FrancoItaly]

What I mean is to put a switch after the oscillator so that before exploring, we can set the zero volt limit of the sensor output in different geographical areas with a voltmeter, then put the oscillator in the circuit to explore, please.

Maybe I didn't explain myself well, if you disconnect the oscillator at the sensor stage output there are 0V anywhere in the world.

[Babak Ruby]

I am using the digital display in your plan and I want to put a switch for the oscillator to make sure that the output of the sensor is zero in different areas and then connect the oscillator.

[Babak Ruby]

I doubt that this will not have a negative effect on the performance of the oscillator

[abdou2014]

HI DEAR FRIEND FRANCO , I HAVE A FRIEND WHO HAVE PROBLEM IN VOLTAGE OUTPUT TR5 ?

[FrancoItaly]

You can decrease R13 from 4.7K to 3.9K or 3.3K to get around 4V but 3.3V is an acceptable value. Regarding TR5, the correct voltage is obtained during the calibration phase as explained in the helps.

[abdou2014]

HE HAS 0.3 V AT TR5 EMITER

[FrancoItaly]

As I told you the voltage on the emitter of TR5 depends on the setup.

[Basellafe]

The same problem l have 3mv

[FrancoItaly]

The same problem l have 3mv

With the quartz disconnected can you get a self oscillation? Are the transistors all type "C" with gain greater than 500? To increase the gain (and obtain self oscillation) as well as increasing C13/c14 you can decrease R10/R12, for example 560 or 470 ohms.

[Basellafe]

Without quartz 0 volt on tr5 emeter tr1and5 is bc549c tr2.3.4 isbc183c i tryed to change value to resester 10 .12 no change and 4.7 no change

[FrancoItaly]

Without quartz 0 volt on tr5 emeter tr1and5 is bc549c tr2.3.4 isbc183c i tryed to change value to resester 10 .12 no change and 4.7 no change

Connect the quartz and vary C2/C3/C4 until you have an output voltage, for example leave only C2 (1 pF), if that's not enough put C2/C3 in parallel (2 pF). The self oscillation is due to a parasitic connection of the pcb, maybe it doesn't happen in your case.

[FrancoItaly]

I post the Dream Man pcb at the request of a forum member.