10 Hz to 10 kHz VCO (CB8746E)

This 3-decade operating range VCO was found in a 90s Popular Electronics. The circuit uses components that admit of equivalents.

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Amplifier for 12 V (CB8962E)
This configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
Step-up attenuator (CB26096E)
This signal attenuator was suggested by Electronics Now magazine in April 1999. The circuit is...
Gain 100 Amplifier 741 (CB11923E)
The voltage gain of this DC amplifier is 100 times, given by the relationship between R2 and R1....