4

Just regard it as an amplifier with feedback where the real input is set to a value of zero: - in negative feedback the feedback signal is added to the input signal, in positive feedback is subtracted. So in the first situation we use and adder circuit, in the second one a subtractor circuit. Feedback +/- input is the same as feedback +/- 0 when the ...


4

Notice the spec for "frequency pull range". Voltage at the control oin is only able to tune the frequency by a few hundred ppb, not by 20% that your application needs. If you want to use this device type in your application, you'll need to buy one with center frequency of 80 MHz. Then you can use the control pin to compensate for small errors in the ...


3

You schematic is 100 % accurate. Funny thing is that on a simulator, if all the thresholds and RC values are identical, it won't startup as all LED drivers go high and low at the same time. This circuit works by the voltage difference between stages and can drive about 7mA. So just change any part a bit in value and be sure to have a cap across IC for ...


3

From the datasheet both types can be used. Just select the type in FW.


3

The datasheet (ACO-40.000MHZ-EK datasheet) indicates the oscillator is not a sine wave one and already outputs CMOS level digital signal suitable for 5v logic. You don't need a Schmitt trigger buffer.


2

Neither the 4060 nor the 4521 will get you to a 1Hz output from a 32768 Hz crystal by itself. You need a division of 2^15. The least a 4521 will divide by is 2^17. The most a 4060 will divide by is 2^14, which needs another /2 from some suitable source. You could use an HC74, or CD4013, or one stage of an HC393 or 390, there are a lot of different ICs that ...


1

Non linearities in the transistor will inevitable make the loop gain equal to 1 at some peak to peak amplitude and, the natural impact of this is that the amplitude is difficult to precisely predict (not normally a big deal). The second impact is that the sine wave output will be naturally flattened on one or both peaks and, again, this is often not regarded ...


1

In feedback systems the feedback signal is fed back to the input of the amplifier. This definition does not require that it is added or substracted from an external input signal. In oscillating systems there is no input node - however, if you want you can create an input node and you can use it - for test resp. calculation purposes - to connect an external ...


1

A PSD followed by a VCO can form a PLL, if the PSD output voltage can produce a correct tune voltage for the VCO. That PLL will be stable, and have a bandwidth defined by the gain round the loop. However, we invariably add a loop filter to a PLL to make it 'better', better at following the reference phase, and better at rejecting the reference high frequency ...


1

You can find 3.2 x 2.5mm crystals https://www.digikey.com/products/en/crystals-oscillators-resonators/crystals/171?k=crystal&k=&pkeyword=crystal&sv=0&pv46=10964&sf=1&FV=1989%7C0%2Cmu8MHz%7C2150%2C-8%7C171%2C69%7C409393&quantity=&ColumnSort=0&page=1&stock=1&pageSize=25 Surely that and two 0402 caps are smaller ...


1

In case that NO energy is in my system, does it oscillate? -> Falstad shows an oscillation without any source connected (maybe noise?) With no power source, it won't oscillate. Oscillators need a power source. Falstad is probably applying generic supply voltages to the op-amp Since Uc is decr/increasing to U+, uC never reaches U+, so WHY does ...


1

You will have a better chance of success if you connect one of the capacitors to V+ rather than ground. Observe polarity. This will create one low output on power up that will ( hopefully) ripple through the others. The above suggestion will start oscillations, but I am not sure if they will be sustained. Since the goal seems to be to light the LEDs in ...


1

Please draw your schematics so they flow left to right as much as possible. I have redrawn the left portion so it is easy to follow. At power-on, all the caps will be discharged, and all the three outputs will be high. All the caps will charge and when they have reached the switching threshold, all 3 outputs will switch nearly simultaneously. This is not ...


1

You're using a definition from wikipedia which explicitly has failed verification: Obviously, tread carefully if you use wikipedia, and twice so if the authors of the wikipedia page disagree on something. Generally, the quality of wikipedia on fundamental EE is often not very good. Do not use Wikipedia as only source! (that goes for anything, basically, ...


1

You only misunderstood ... "The AOCJY series of Oven Controlled Crystal Oscillators are designed to facilitate reference frequencies from 10.00MHz to 100MHz carrier." .. to mean that was done with a Pot but they dont tell you its done with a PLL internally and is pre-set during order. It is actually an ultra-stable SC cut crystal used for stratum clocks ...


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