Head or Tail 7400 (CB11496E)
Headphone amplifier (CB12966E)
Supercapacitor charger with the LTC3225 (CB12945E)
Power supply using a Transistor as Rectifier (CB12851E)
Proximity Relay (CB12835E)
AC Amplifier (CB12766E)
Sawtooth generator (CB12679E)
Timer for Windshield Wiper (CB12638E)
1 Hz Low Pass Filter (CB12563E)
Audio Peak VU (CB12436E)
VCO CMOS (CB12340E)
Touch Switch (CB12332E)
Undervoltage Indicator CA3140 (CB12312E)
Divider by 4 320 000 (CB12304E)
Crescent Tone Siren (CB12284E)
Sound Effects Generator (CB12229E
Audio Stage with Bootstrap (CB12203E)
Telephone in Use Line Indicator (CB12177E)
Different Two-Way Control (CB12059S)
Two Transistor DC Motor Control (CB12043E)
Hartley Continuity Tester (CB11947E)
1926 Galena Radio (CB11877E)
Diac Voltage Sensor (CB12992E)
Electronic Siren (CB12926E)
Noise Silencer (CB12872E)
Square Wave Generator (CB12810E)
Medium Power Transistorized Amplifier (CB12699E)
Light Alarm (CB12619E)
Light Alarm with the 741 (CB12591E)
Proximity Detector (CB12547E)

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Circuit Bench

  • 1 5 V LED (CB20424E)

      In the figure we have the way to activate a red LED that needs 1.7 V or even others with higher...

  • Charger Nicad (CB12119E)

      This circuit was obtained in a 1979 publication, but it can be assembled with the BD135 instead of the...

  • Voltage comparator (CB9463E)

      Found in Radio Electronics from the 90's, this circuit employs a 3140 operational amplifier, still...

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