Fast log generator (CB7595E)

We found this circuit in a 90s Popular Electronics. The operational amplifier can be replaced by current equivalents.

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Amplifier for photodiode 1 (CB6787E)
We found this circuit in Harris' 90s documentation. The circuit applies to modern operational...
Crystal oscillator (CB7539E)
Found in a 90s magazine for radio amateurs, this circuit can generate frequencies up to 45 MHz...
Two Diode Balanced Modulator (CB4233E)
This is yet another balanced modulator circuit for SSB transmission. This two-diode circuit was...