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Title
DC power source with transistor (CIR22516E)
555 Voltage Monitor (CB26309E)
Car Audio Booster (CB26288E)
Intermittent Alarm (CB26233E)
Frequency counter amplifier (CB26255E)
3 to 5 V Amplifier (CB26110E)
Refrigerator Monitor (CB26012E)
Second Order High Pass Filter (CB25995E)
Time Base (CB25100E)
Shortwave Converter (CIR25053E)
Closed Loop Alarm (CB26227E)
Longwave Converter (CB26178E)
Digital Wind Indicator (CB26031E)
Battery Status Indicator (CB26051E)
Dual 5V Power Supply (CB25970E)
Zero-crossing synchronized switch (CB25077E)
4093 Controlled Oscillator (CB25019E)
5-Step Sine Wave Generator (CB24476E)
Shadow Switch with the CA3140 (COM12159E)
Stereo decoder (CR23862E)
40W Amplifier LM1876 (CB26265E)
Active phantom load (CB26208E)
RF Wattmeter (CB26093E)
Fluorescent Inverter (CB25996E)
Sinusoidal oscillator 741 (CB25101E)
Keyboard Encoder (CB25054E)
Battery Saver (CB26310E)
Turn signal reminder (CB26289E)
Light or Heat Alarm (CB26234E)
Current and Voltage Protector for Op Amp (CB26256E)

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           With the presented circuit it is possible to detect signals from transmitters in a frequency range...

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            This circuit was obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on...

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