Rectangular and triangular VCO (CB8748E)

This circuit was found in a Popular Electronics from the 90s. The frequency range generated depends on C1. The transistor is for general purpose.

MAX14690 Evaluation Kit for Load Management Solution - Maxim
The MAX14690 evaluation kit, a solution Maxim for battery charge management in wearables, can be...
RF Wattmeter (CB4886E)
This watt meter was found in an old telecommunications documentation. The circuit is interspersed...
Gain 100 Amplifier (CB25187E)
This AC operational amplifier has a power stage and a gain determined by R2. The maximum output...