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The circuit below is a PW modulating circuit:

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The output of the circuit is:

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But when I connect a resitive load to the output of the op-amp. The output vanishes:

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Can someone explain why is it happening so?

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    \$\begingroup\$ The word "op-amp" is an abbreviation of "operational-amplifier". It's not an initialisation so it doesn't get capital letters. \$\endgroup\$ – Transistor Jun 5 at 19:41
  • \$\begingroup\$ Is it so,Thank you. \$\endgroup\$ – Newton Nadar Jun 5 at 19:42
  • \$\begingroup\$ What about my question? \$\endgroup\$ – Newton Nadar Jun 5 at 19:43
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    \$\begingroup\$ It may depend on the value of the resistive load. \$\endgroup\$ – Brian Drummond Jun 5 at 19:46
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    \$\begingroup\$ U2 and B1 are not connected to ground. \$\endgroup\$ – Transistor Jun 5 at 19:47
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Figure 1. B1 and U2 are missing their ground connection.

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