Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

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LM741 100 Hz Second Order High Pass Filter (CB25934E)
This filter was found in the May 1989 issue of Radio Electronics magazine. The power supply must...
3-tone Unjunction Oscillator (CB3849E)
Depending on the key pressed, this oscillator produces a different tone, set in the corresponding...
LT1037 Sinusoidal Oscillator (CB4396E)
The 1 kHz Wien bridge oscillator presented was found in the 1993 Linear Technology Applications. The...