Security Circuits

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Courtesy Lighting with 7555
450 watts / 3.5-30 MHz Linear amplifier
100K megohm DC probe
Grid Dip Oscillator (GDO) Instrument
simple mic pre-amp based LM358
ADC to 8051
Hampton Bay Air Conditioner IR Remote Control Reverse Engineer
ttl three state logic probe circuit
Stepper Motor Controller Schematic
Laser Power Supplies
Im trying to repair a Samsung SCR-3000 DVR COMBO for my security
Pulse signal generating circuit and display