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Your system is unstable because you have a pole in the right half plane, and the result is that the output grows unbounded.
Any non-ideal op-amp has a finite DC gain \$\ A_0 \$ and a finite bandwith (crossover frequency \$\ \omega_c\$ below infinity) such a non ideal op-amp can be approximated as a single pole low pass filter, with the following transfer ...
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I think the problem is simply that the pulse is too short to charge the capacitor fully. I created a simulation using CD4000 series inverters at a time scale long enough that propagation delays are insignificant, and with an external resistor to ensure symmetrical output resistance. It showed the same effect as your circuit.
With this short pulse length ...
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You can actually buy a quad 2-input XOR gate IC, and use 2 of them to implement this.
Part No: 74HCT86
Only about $0.50 each on digikey.
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It seems that you are asking about the power used by a fetal doppler device such as a baby heart monitor.
It says in the instruction book that the power output is 20 mW/ square centimeter ...
That tells you that the mechanical or sonic energy output by the device will be 20 mW/cm2. Therefore the total output power will be area × 20 mW where the ...
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Because the 123 has both positive and negative trigger inputs, it is possible to feed the output back to the input and create an oscillator. However, it is not as simple as it might seem because the timing capacitor needs time to discharge between cycles. The result is an oscillator circuit that is less accurate/precise/stable than a 555 circuit.
Your ...
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Is there [...] a tool that will help me search through the alternatives in future
You can use distributor's sites to search for such optocoupler/solid state relay:
Search for TLP175A on e.g. mouser.com, find which product group it is in.
All Products Opto-electronics > Optocouplers/Photocouplers > MOSFET Output Optocouplers > Toshiba TLP175A(TPL,E)
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