Car Parking Aid Circuits

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60W audio amplifier
Metal detector with 4030 CMOS
hi-fi audio amplifiers with tl072
homemade Geiger counter with UGP interface
ultrasonic receiver
MM5314N Driven Digital Clock Circuit
VFD Clock
Thermocouple cold junction compensation RTD has XTR101 Input Circuit
Broadband 100MHz ultra-wideband DC amplifier
The sound of a photoelectric conversion circuit