This peak detector has a memory to prolong the response. The circuit is from American documentation from the 1980s. The supply does not have to be symmetrical.
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
May 2017 - The new 36V TLVx171 Series of General Purpose Operational Amplifiers from Texas...