Audio Tone Balance Circuits

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Hour time-delay sampling circuit
Wireless am microphone
Simple voltage controlled oscillator
the monitoring systems of railway level crossing of mining area of Atmega128 one-chip computer and GPRS
Zero crossing detector: do I really need the 7W resistor
remote control 315mhz
Solar Relay
High Voltage Electrolytic Capacitor Reformer
High voltage power supply and boost for the BST capacitor DAC provides a tuning signal circuit diagram