Colpitts Oscillator Circuits

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5 watt, 80 meter QRP CW Transceiver
5 Mhz phase encoding
Door Knock Alarm Circuit
Home Built Laser Projector
noise canceller
crystal oscillator discreet pierce oscillator
the octal phono preamplifier
Variable on-off times circuit using two 555 timers
ADUC836 1MIPS 8052 MCU + 62kB Flash + Dual 16-Bit ADC + 12-Bit DAC
Output Assign Module
Ultrasonic transmitter circuit
Delayed type AGC circuit diagram of principle