Schematic & Wiring Diagram

AC to DC 90 Watt Switching Adaptor Circuit

AC to DC switching adaptor circuit with best achievement ability of 90W. Switching ability accumulation is congenital application a aerial voltage ability switching regulator IC MC33374 and some added added components. The MC33374 IC is a caked aerial voltage ability switching regulators that are distinctively advised to accomplish anon from a rectified AC band source, and in flyback advocate applications.

LM390 Simple 2-Way Radio Intercom Circuit

This is a actual simple two way intercom ambit based on a LM390 audio amplifier ambit . the intercom ambit is a stand-alone cyberbanking communications arrangement advised for bound or clandestine dialogue. For this ambit you can use a 8 ohms speaker, one for anniversary base and crave a 6 volts dc ability supply. Accretion ascendancy can be done by capacitively coupling a resistor (or FET) from pin 6 to ground.

The LM390 Ability Audio Amplifier is optimized for 6V, 7.5V, 9V operation into low impedance loads. The accretion is internally set at 20 to accumulate the alien allotment calculation low, but the accession of an alien resistor and capacitor amid pins 2 and 6 wil access the accretion to any amount up to 200. The inputs are arena referenced while the achievement is automatically biased to one bisected the accumulation voltage.

11-90 hz Subwoofer Filter Using TL072 Op-Amp

The Subwoofer clarify ambit to abolish for abstracted pre amplifier to drive the low abundance complete a lot. In tone, alarm tone, accustomed Can not be done … is a accomplished abysmal low bass sounds like a bass drum, or at a cine circuitous in a low articulation if we can be heard with But to add cabinets and amps. The subwoofer ambit is canyon low abundance with in 11-90 Hz. Switching ability accumulation 12V cut out if they charge to use +-15V. I had change the Capacitor to cut out vocals per the red amphitheater mark.

45w Single Chip Amplifier with Tone Control

This abuttals is based on the National Semiconductor LM3876. This accent is able of accustomed as abounding as 56W of affiliated boilerplate adeptness into an eight ohm bulk with 0.1% THD from 20Hz to 20Khz. Be constant to board an able calefaction bore for the package.

Use log pots for volume, bass and treble. A stereo amplifier can be complete appliance ganged pots and a Stancor 402 abettor instead of the 401.

Note that the charge of adeptness to the speakers is primarily a activity of the adeptness accession voltage and adaptation in Class A amplifier. In our case, we’re appliance a +/- 33 volt volt accession which is brash about a Stancor RT401 transformer. Use astute absorption aback animate with bandage voltages.

P1_____________22K Log. Potentiometer (Dual-gang for stereo)

R1______________1K 1/4W Resistor

R2______________4K7 1/4W Resistor

R3____________100R 1/4W Resistor

R4______________4K7 1/4W Resistor

R5_____________82K 1/4W Resistor

R6_____________10R 1/2W Resistor

R7_______________R22 4W Resistor (wirewound)

R8______________1K 1/2W Trimmer Cermet (optional)

C1____________470nF 63V Polyester Capacitor

C2,C5_________100µF 3V Tantalum bead Capacitors

C3,C4_________470µF 25V Electrolytic Capacitors

C6____________100nF 63V Polyester Capacitor

D1___________1N4148 75V 150mA Diode

IC1________TLE2141C Low noise, high voltage, high slew-rate Op-amp

Q1____________BC182 50V 100mA NPN Transistor

Q2____________BC212 50V 100mA PNP Transistor

Q3___________TIP42A 60V 6A PNP Transistor

Q4___________TIP41A 60V 6A NPN Transistor

J1______________RCA audio input socket

Power supply parts:

R9______________2K2 1/4W Resistor

C7,C8________4700µF 25V Electrolytic Capacitors

D2_____________100V 4A Diode bridge

D3_____________5mm. Red LED

T1_____________220V Primary, 15 + 15V Secondary, 50VA Mains transformer

PL1____________Male Mains plug

Long Range AM transmitter circuit Diagram

The ambit for a able AM transmitter application bowl resonator/filter of 3.587 MHz is presented here. Resonators/filters of added frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may additionally be used. Use of altered abundance filters/resonators will absorb agnate aberration in the amount of inductor acclimated in the catchbasin ambit of oscillator affiliated at the beneficiary of transistor T1.

The AF ascribe for accentuation is amid in alternation with emitter of transistor T1 (and resistor R4) application a transistor radio blazon audio disciplinarian agent as apparent in the circuit. Articulate RF achievement is developed beyond the catchbasin ambit which can be acquainted to resonance abundance of the filter/resonator with the advice of assemblage condenser C7. The abutting two stages formed application low-noise RF transistors BF495 are, in fact, affiliated in alongside for addition of articulate arresting accompanying from beneficiary of transistor T1 to bases of transistors T2 and T3. The accumulated achievement from collectors of T2 and T3 is fed to antenna via 100pF capacitor C4.

The ambit can be calmly accumulated on a general-purpose PCB. The ambit of the transmitter is accepted to be one to two kilometers. The ambit requires adapted 9-volt ability accumulation for its operation. Note: Dotted lined indicates added affiliation if a 3-pin clarify is acclimated in place.

Circuit Diagram-Digital Volume Control

This ambit could be acclimated for replacing your chiral aggregate ascendancy in a stereo amplifier. In this circuit, push-to-on about-face S1 controls the advanced (volume increase) operation of both channels while a agnate about-face S2 controls about-face (volume decrease) operation of both channels.

A readily accessible IC from Dallas semiconductor, DS1669 is acclimated here.

FEATURES:

* Replaces automated capricious resistors

* Electronic interface provided for agenda as able-bodied as chiral control

* Wide cogwheel ascribe voltage ambit amid 4.5 and 8 volts

* Wiper position is maintained in the absence of power

* Low-cost another to automated controls

* Applications accommodate volume, tone, contrast,brightness, and dimmer control

The ambit is acutely simple and bunched acute actual few alien components. The ability accumulation can alter from 4.5V to 8V.

We alone charge to ascertain the freezing point with this circuit. That is why there is a comparator afterwards the temperature sensor, which turns an LED on if the temperature has alone beneath 0 °C during the advance of the night. To ensure that the comparator operates appropriately it is all-important that the altitude amount can become hardly added abrogating with account to the input. To break this problem, a diode (D1) has been affiliated in alternation with the arena affiliation of the LM35. The voltage bead beyond D1 (because of the baby accepted through the LM35 this is alone 0.47 V) acts as 'negative' ability supply. Since the non-inverting ascribe of comparatorIC2 is affiliated via R3 to the anode of D1 it functions as the 0°C-reference akin for the comparator.

Comparator

The comparator is a accepted opamp blazon TLC271, which we configured for basal accepted burning by connecting the bias-select ascribe (pin 8) to the ability accumulation voltage. There is no charge for the detector to be fast and it will accordingly assignment able-bodied with the opamp operating in its best economical mode.

LED D3 provides the frost indication. It is the ambition that the LED stays on already the temperature in the allowance drops beneath freezing or back it has been beneath freezing. To realise this, an agee hysteresis is created with the aid of R3, R4 and D2. The burning that the achievement goes high, the non-inverting ascribe goes added absolute via D2 and R4, and the achievement accordingly stays high. The temperature would now accept to access to added than about 30° afore the LED will go out by itself. In convenance this apparently agency that it is summer and that it is not acceptable to benumb anyway. If charge be, the hysteresis can be added by accretion the amount of R3.

Capacitor C2 is added to accomplish abiding that the LED charcoal off (the ambit is reset) back the ability accumulation is connected. The non-inverting ascribe of the opamp is briefly affiliated to arena and the achievement is accordingly low. R1 and S1 are alone appropriate if the ambit needs to be displace back the array is connected. Instead of S1 you could additionally use a ability accumulation about-face or alike aloof artlessly abstract the array for a moment.

Thrifty Ability supply

Since the ambit is affected to be powered from a array there was a acquainted accomplishment to minimise the ability consumption. The accepted burning of the prototype, at a ability accumulation voltage alignment from 6 to 9 V, was beneath than 120 μA. Back the LED is on, the accepted burning rises to alone 1 mA at 6V and 1.8 mA at 9V, because a low accepted LED is used. In our ancestor we acclimated a green, low-current LED.

If four AA penlight batteries (with a accommodation of about 2 Ah) are used, again the ambit will run for about two years in standby mode. Back the LED is on this is appreciably shorter, of advance (about two months, this is calmly continued abundant to run through a astringent winter period). A accepted 9-V array will additionally aftermost a distinct winter, provided you frequently analysis whether the LED is on.

Finally, a animadversion about the TLC-271CP acclimated here. The adaptation with the C-suffix is defined for an operating ambit from 0 to 70 °C, but will abide to assignment at lower temperatures, decidedly because that the IC is not acclimated in a beeline application. If in agnosticism you can consistently try to get your easily on a adaptation with the I-suffix (that is, TLC271IP: –40 to 125°C). But that is alone all-important if you apprehend it to be absolute algid in the monitored room...

Traffic Light Schematic Diagram

This action operates red, amber and blooming LEDs in the absolute adjustment for a audible UK cartage light. The time taken for the complete red – red & amber – blooming – amber adjustment can be different from about 7s to about 2½ annual by adjusting the 1M preset. Some amber LEDs allow afire that is about red so you may accept to use a craven LED.

The 555 astable abuttals provides anxiety pulses for the 4017 adverse which has ten outputs (Q0 to Q9). Each accomplishment becomes aeriform in changeabout as the anxiety pulses are received. Appropriate outputs are accumulated with diodes to accession the amber and blooming LEDs. The red LED is affiliated to the ÷10 accomplishment which is aeriform for the ancient 5 counts (Q0-Q4 high), this saves appliance 5 diodes for red and simplifies the circuit.

Here The Traffic Light Part List :

• resistors: 470 ×3, 22k, 100k
• capacitors: 0.1µF, 1µF 16V radial, 10µF 16V radial
• diodes: 1N4148 ×6
• LEDs: red, amber (or yellow), green
• 1M preset, horizontal
• 555 timer IC, such as NE555
• 4017 counter IC
• DIL sockets for ICs: 8-pin, 16-pin
• on/off switch
• battery clip for 9V PP3
• stripboard: 20 rows × 21 holes

Speed Fan Control Circuit using IC CD4017B Circuit

The simple abstraction activity is use IC CD4017 to ascendancy 4 relays which affix anniversary pole. IC CD4017B which is counter-cum-1kHz decoder and the arresting is disconnected into ten according intervals, Which can be programmed, via the distinct location, 10-mode.

According to the backward advertisement of the continuance of the acting period, the agnate achievement of the CD4017 inhibits adverse CD4017 (per pole of circling and diode D6), and fires the triac.

Here transistor T2 acts as a disciplinarian transistor. Pin by 4017, with aught at the achievement of the sensor for the about-face to 0(zero ascertain output) anniversary canyon through zero.

Remark. The accepted beachcomber forms of assertive positions of the rotary switch, as declared in EFY Lab are in the account 1.

The ambit is able to administer for a ambassador in the activity lighting equipment, hot air, oven singal Universal AC motor, heating, etc.

Simple Analog to Digital Converter (ADC) Circuit Diagram

Normally analogue-to-digital con-verter (ADC) needs interfacing through a chip to catechumen alternation abstracts into agenda format. This requires accouterments and all-important software, consistent in added complication and appropriately the absolute cost.

The ambit of A-to-D advocate apparent actuality is configured about ADC 0808, alienated the use of a microprocessor. The ADC 0808 is an 8-bit A-to-D converter, accepting abstracts curve D0-D7. It works on the assumption of alternating approximation. It has a absolute of eight alternation ascribe channels, out of which any one can be called application abode curve A, B and C. Here, in this case, ascribe approach IN0 is called by accomplishments A, B and C abode lines.

Usually the ascendancy signals EOC (end of conversion), SC (start conversion), ALE (address latch enable) and OE (output enable) are interfaced by agency of a microprocessor. However, the ambit apparent actuality is congenital to accomplish in its affiliated approach afterwards application any microprocessor. Therefore the ascribe ascendancy signals ALE and OE, actuality active-high, are angry to Vcc (+5 volts). The ascribe ascendancy arresting SC, actuality active-low, initiates alpha of about-face at falling bend of the pulse, admitting the achievement arresting EOC becomes aerial afterwards achievement of digitisation. This EOC achievement is accompanying to SC input, area falling bend of EOC achievement acts as SC ascribe to absolute the ADC to alpha the conversion.

As the about-face starts, EOC arresting goes high. At abutting alarm beating EOC achievement afresh goes low, and appropriately SC is enabled to alpha the abutting conversion. Thus, it provides affiliated 8-bit agenda achievement agnate to direct amount of alternation input. The best akin of alternation ascribe voltage should be appropriately scaled bottomward beneath absolute advertence (+5V) level.

The ADC 0808 IC requires alarm arresting of about 550 kHz, which can be calmly acquired from an astable multivibrator complete application 7404 inverter gates. In adjustment to visualise the agenda output, the row of eight LEDs (LED1 through LED8) accept been used, wherein anniversary LED is affiliated to corresponding abstracts curve D0 through D7. Since ADC works in the affiliated mode, it displays agenda achievement as anon as alternation ascribe is applied. The decimal agnate agenda achievement amount D for a accustomed alternation ascribe voltage Vin can be affected from the relationship