Metal Detector Schematic Using CS209A

A very simple metal detector electronic project circuit can be designed using the CS209A integrated circuit manufactured by Cherry Semiconductor.The CS209A integrated circuit is a bipolar monolithic integrated circuit for use in metal detection proximity sensing applications.The CS209A metal detector contains two on-chip current regulators, oscillator and low-level feedback circuitry, peak detection/demodulation circuit, a comparator and two complementary output stages.The oscillator, along with an external LC network, provides controlled oscillations where amplitude is highly dependent on the Q of the LC tank.

Metal Detector Schematic Circuit Diagram

The detector, is a single 100uH coil. The IC has an integral oscillator the choke forms part of an external LC circuit, its inductance being changed by the proximity of metal objects. It is the change in oscillation that is amplified and demodulated. Led 1 will light and the buzzer will sound when the inductance its changed. Set up is easy : R5 is adjusted with the LC away from any metal source so that the LED lights and buzzer sounds. The control is backed off so that the LED goes out and buzzer stops. When the choke comes into contact with any metal object that alters its inductance, LED 1 and the buzzer will activate.

FOr this electronic project youll need the following electronic parts: R1=220ohms, R2,R5=10k,R3=1k ,C1,C3=2.2nF; C2=10uF. Entire circuit can be powered from a 9 volts battery.

TA7230P TA7236P TA7237AP amplifier schematic

Amplifier circuit here is all based on the ic in the gains. Three IC TA7230P, TA7236P, TA7237AP is intregated circuit (IC) which was applied to the power amplifier. Each IC has a different output, different input voltage, all IC TA7230P, TA7236P, TA7237AP is manufactured by Toshiba.

You can see maximum minimum voltage , power output , and other here

TA7230P, TA7236P, TA7237AP amplifier schematic

1997 Audi A4 Air Conditioning System Circuit and Schematic Diagram on 1997 Audi A4

The following wiring diagram / scematic shows 1997 Audi A4 air conditioning system Circuit and Schematic Diagram which consists of A/C control head, footwell/defroster, flap motor and sensor, temperature regulator, motronic engine control module, interior temperature fan and sensor, digital outside air temperature/ transmission range selector lever display, sunlight photo sensor, A/C compressor speed sensor, outside temperature sensor, fresh air intake duct, fuse panel and instrument cluster, A/C compressor clutch relay, central flap motor and sensor, back pressure motor and sensor, center outlet temperature sensor, fresh air blower, coolant fan control thermal switch, coolant fan, and coolant fan control relay. 

For detailed information about 1997 Audi A4 Air Conditioning System Circuit and Schematic Diagram here (diagram 1 and diagram 2, source: autolib.diakom.ru)