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I suspect the the frequency of the oscillator may be too high for your oscilloscope to display properly. …

Sometimes a low frequency secondary oscillator like this might be used for more than one peripheral (e.g. alt clock for timer) but in this case I think it is only used for the RTC. …

You can make a Pierce Oscillator similar to that shown in your question: The "single input amplifier" is usually a simple CMOS inverting gate, like the 74HC7404 (6 inverters in one package), SN74HC14D … You can only pull the frequency of a crystal oscillator a very small amount, so you will need a 4.096MHz crystal. Either that or you will need to use something else such as a PLL. …

You only need the 32kHz oscillator if you want to have a low speed oscillator present for uses like the RTC (Real Time Clock) peripheral, or low speed system clock operation. … for oscillator design is the Microchip AN588 - PIC oscillator design guide. …

Also, given the price of decent CMOS oscillators nowadays, the other option is just to buy a 16MHz CMOS oscillator (5V supply tolerant) and replace the first stage with that. …

Looks like a Phase Shift oscillator to me. …

Although it's often shown as one inductor with a tap taken off somehwere, you can use two separate inductors for a Hartley oscillator. …

The reason I ask is that if the oscillator never reaches stability then it is very likely something quite fundamental such as power supply problems. …

W5VO has explained things well, oscillators in SPICE can be really tricky, and sometimes just don't work correctly at all. The opamp model you are using can sometimes stop things working (sometimes th …

If you really mean just an oscillator (the crystal is only part of one as Steven says), a battery and an antenna, then the answer is no, not a radio that will be of much use anyway. …

Any type of cap is fine for this circuit - it shows electrolytics in the schematic due to them being cheaply available in large values (e.g. >10uF) Previously you could not get ceramics of this size, …

Here is an example from the datasheet of the code to switch over to Primary Oscillator with PLL (you need to check/set the divider/multiplier bits according to your frequency - this is for 20Mhz crystal … operating freq): int main() { // Configure PLL prescaler, PLL postscaler, PLL divisor PLLFBD=30; // M = 32 CLKDIVbits.PLLPOST=0; // N1 = 2 CLKDIVbits.PLLPRE=2; // N2 = 4 // Initiate Clock Switch to Primary Oscillator …

Yes, the 16F84 does need an external oscillator. It is a very old PIC. … However almost all of the newer PICs have an Internal RC Oscillator that can be selected, which will be mentioned in the datasheet. …

If you had both probes on the oscillator output it's easily understood with the extra capacitance as Martin mentions, but as you described it they are not so something else must be happening. … I just had a look at a typical 10MHz CMOS oscillator, and the rise/fall times were given as 10ns, so that's 20% of each cycle and will not look that square. …

For a low distortion audio sinewave, the Wien Bridge oscillator is widely used: The RC filters provide a 0 degree phase shift at the desired frequency providing positive feedback to keep the oscillation … I made a little audio test oscillator which gave excellent results from a dsPIC33FJ64GP802 which has 2 good quality 16-bit audio DACs onboard. …