Wiring Diagram circuit

The ALD07 demonstrator is one in a range of self-contained fully operational auto electrical trainers designed for teaching basic electrical principles. Manufactured using original real vehicle components.
Full operation of headlights, side lights, brake lights indicators and alternator via a speed controller can be observed.
The following vehicle circuits and systems are included:

    Starting
    Charging
    Ignition
    Lighting

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Circuits of this kind are intended to drive LED Arrays in order to create more visibility and conspicuity when a vehicle is stopped or stopping. This circuit, in particular, will emit a visual alerting signal of 4 short flashes, followed by a steady on light that remains steady on as long as the brakes are applied.
Parts:

R1_____________10K 1/4W Resistor
R2____________220K 1/4W Resistor
R3____________500K 1/2W Trimmer, Cermet or Carbon
R4______________1K8 1/4W Resistor (See Note)
R5______________1K8 1/4W Resistor
C1_____________47µF 25V Electrolytic Capacitor
C2______________1µF 25V Electrolytic Capacitor
C3_____________10nF 63V Polyester Capacitor
D1___________1N4148 75V 150mA Diode
IC1____________4060 14 stage ripple counter and oscillator IC
Q1____________BC327 45V 800mA PNP Transistor (See Note)
SW1____________SPST Brake Switch
B1______________12V Vehicle Battery

IC1 internal oscillator generates a square wave whose frequency is divided 64 times by the flip-flops contained in the chip in order to obtain about 1 to 4Hz at pin #4: this is the LED Array flashing frequency and can be set to the desired value by means of R3. A positive signal at D1 Cathode stops the oscillator after 5 pulses are counted. C2 and R1 automatically reset the IC whenever the brakes are applied. Q1 is the LED Array driver: LEDs will be on when pin #4 of IC1 goes low

Note:
* The transistor type suggested for Q1 will drive LED Arrays at currents up to 500mA. To drive Arrays requiring higher currents (up to 1A and even more) use a BD436 (32V 4A PNP Transistor) for Q1 and a 1K resistor for R4.

Sound effects generators trying to imitate rain sound or sea surf are well known to hobbyists from many years: their purpose is to induce relaxation and sleep or to help in concentration and study.The sound generated is restrained to a background level and these devices are frequently kept on the night table.Common designs use invariably Zener diodes or reverse-biased transistors base-emitter junctions as white noise generators. The main snag of these circuits is that a supply of at least 12V is required, therefore a big battery pack or (more commonly) mains supply is used as power source.The aim of this project was to design a small, portable unit, powered by a 3V battery and capable of shutting-down after a preset delay, in order to save power.

Parts:

R1,R2,R13______10K 1/4W Resistors
R3,R5__________33K 1/4W Resistors
R4,R6___________1M 1/4W Resistors
R7____________100R 1/4W Resistor
R8____________330K 1/4W Resistor
R9____________100K 1/4W Resistor
R10____________47R 1/4W Resistor
R11_____________1K 1/4W Resistor
R12____________15K 1/4W Resistor
R14____________47K 1/4W Resistor
R15____________10M 1/4W Resistor
R16_____________1M8 1/4W Resistor
C1,C4,C7______100µF 25V Electrolytic Capacitors
C2,C3,C6______100nF 63V Polyester or Ceramic Capacitors
C8,C10________100nF 63V Polyester or Ceramic Capacitors
C5_____________47µF 25V Electrolytic Capacitor
C9_____________10µF 63V Electrolytic Capacitor
D1___________1N4148 75V 150mA Diode
Q1___________2N3819 General-purpose N-Channel FET
Q2____________BC337 45V 800mA NPN Transistor
Q3____________BC327 45V 800mA PNP Transistor
Q4,Q5_________BC547 45V 100mA NPN Transistors
IC1___________TL062 Low current BIFET Dual Op-Amp
IC2____________4060 14 stage ripple counter and oscillator IC (See Notes)
SW1____________1 pole 3 ways Rotary Switch
SW2____________SPST Slider Switch
SPKR___________8 Ohm Loudspeaker (40 to 85mm. diameter)
B1_____________3V Battery (two AA or AAA cells wired in series etc.)


Two BIFET Op-Amps are used as a good, low voltage supply, very low current, white noise source. A sound resembling to a rain shower is reproduced by the speaker after being amplified by Q2.
The higher part of the white noise spectrum is attenuated by C8, slowly driven into operation by means of Fet Q1 acting as a variable resistor. Therefore, a sort of automatic tone control is obtained.
IC2 provides all the timings: it auto-resets at switch-on, shutting-down the generator after one of three time-delays, chosen by means of SW1. It provides also, through R8, slow charge and discharge of C5, in order to change smoothly high-frequency attenuation. Q3 is used as a dc switch for the generator circuit. Q4 and Q5 are its drivers.

Notes:

* Different operating delays can be chosen by changing R16 and/or C10 value.
* 4060 ICs by some manufacturers are unable to oscillate at 3V supply. Motorolas MC14060 is therefore highly recommended for IC2.
* If a fixed operating delay is desired, SW1 can be omitted and R14 and D1 anode can be hard wired to the proper pin of IC1.
* Output volume can be increased lowering R9 value to about 47K. On the other hand it can be reduced increasing R9 value to about 150K.
* If variable high-frequency attenuation is not needed, C5, C8, Q1 and R8 may be omitted.
* If auto shut-down is not needed, omit R11, R12, R13, R14, Q3, Q4, Q5, C9, D1 and SW1, connecting pin #12 of IC2 to negative ground.
* If only a straightforward white noise generator is required, omit also IC2, R15, R16 and C10 besides the above listed parts.
* Current consumption is about 7mA and less than 600µA when in stand-by mode.
* After shut-down, the circuit can be restarted opening SW2, then closing it again.

Disclaimer: we cant claim or prove any therapeutic effectiveness for this device.