6000D S2

[Nandor]

Looks very complicated, it must have been a lot of work to do this schematic.
Can you explain the comparator stage, please?

regards

[dbanner]

The comparators develop a square wave on their respective pull-up resistors.
For ground balance pot, the phase of the square wave is equal to the phase of the differential signal between the non inverting and inverting inputs. Adjustment of the wiper terminal changes the amplitude of the voltage at the non inverting input, thus changing the phase of the square wave.
The square wave drives the electronic switches such that the two ends of the capacitor across the inputs of the first opamp stage after 4053 are shorted to ground alternatively. Depending on the phase, the capacitor will charge or not charge. Thus a phase sensitive, full wave demodulator is formed.
The range of the phase shift of the comparator is about 15 degrees(6DB schematic)
The X demodulation works the same way except the range of the phase angles is adjusted differently for discrimination.

All this information comes from the service manual.
I learn as I go along.

[kt315]

that layout belongs to the series 1 service manual (retraced).
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i do not find out the service manual. had you put it anywhere?

[dbanner]

Yes

[kt315]

thank you Delta Banner.

[dbanner]

Here is my completed schematic. Power supply will be on separate board. Now comes the challenge to create a PCB layout. I'll use Diptrace.

[dbanner]

Looks very complicated, it must have been a lot of work to do this schematic.
Can you explain the comparator stage, please?

regards

Oh, you meant the comparators in the multiplier section. You're gonna have to read the technical details in the service manual, it's a bit long worded, but the manual states that the output feeding the summing amplifier is roughly proportional to the four quadrant multiplication of the X and R bandpass outputs.
I take it to mean that the comparators together with the switches constitutes a four quadrant multiplier.
Maybe Carl can comment on this section.

[kt315]

did you delete u-amperemeter part? i do not see it on your sch. also, what it do, intensity meter or disc meter?

[dbanner]

did you delete u-amperemeter part? i do not see it on your sch. also, what it do, intensity meter or disc meter?

I omitted the meter and depth circuit, yes. I don't need it. But it can easily be reintroduced by way of a daughter board. I suspect that it is not really that accurate. A VDI circuit would be better.

[kt315]

I omitted the meter and depth circuit, yes.
--
all heart of this sch... was killed cry whites electronics company. cry!

[dbanner]

I omitted the meter and depth circuit, yes.
--
all heart of this sch... was killed cry whites electronics company. cry!

Ha ha. Cry babies. Alas, you must dig! Dig I say, to find me treasure!! Arrrr.

[kt315]

[dbanner]

The multiplier section of the circuit is curious.
Also, I don't like the prospect of a two battery pack power supply. I need a power supply circuit that runs off of a single battery pack.
I also need a trimmer resistor in the clock circuit. Maybe I should go with a 4060 instead.

[walkman]

Maybe this drawing will work for you

[dbanner]

I propose to use this circuit for the TX section. Does anyone know where to get ltspice subcircuit for a CD4024B