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| Micro Power AM Broadcast Transmitter In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator |
| Single Op-Amp Bandpass Filter Filter A bandpass filter passes a range of frequencies while rejecting frequencies |
| Low Power Op-Amp - Audio Amp (50 milliwatt) The example below illustrates using an op-amp as an audio amplifier for a simple intercom. |
| Decibel Meter The circuit below responds to sound pressure levels from about 60 to 70 dB |
| 2nd Order Opamp Filters The figures below illustrate using opamps as active 2nd order filters |
| Whistle On - Whistle Off Off This is an extension of the CMOS toggle flip flop circuit shown in the "Circuits controlling relays |
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