Digital recorder ISD1016 (CB7963E)

Found in a Popular Electronics from the 90s, this digital recording circuit uses an unusual integrated circuit today.

5 V x 1.25 A power supply (CB13354E)
This common configuration source was obtained from old documentation, so the components can be...
250 Hz Low Pass Filter (CB13602E)
This third-order filter was found in a 1975 publication. The circuit must be powered by a...
Power Oscillator (CB12692E)
This circuit is basically the same configuration as the previous one with a power stage with...