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Useful for power lines control, Simple, transformer less circuitry. This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an increase in ac or dc supply voltage needs to be detected. D3 illuminates when the line voltage is approaching 120V and will remain in the on state also at 240V supply. On the other hand, D6 will illuminate only when the line voltage is about 240V and will stay on because the latching action of Q1, Q2 and related components. C1, D1 and D2 provide a low dc voltage in the 4.5V - 6V range in order to allow proper operation of latch circuit and LEDs. 110 and 220V AC LED Voltage Indicator Circuit diagram: 110 and 220V AC LED Voltage Indicator Circuit Diagram Parts: R1__________470R 1/2W Resistor R2__________220K 1/4W Resistor R3,R7_______470R 1/4W Resistors R4__________1K 1/4W Resistor R5__________2K2 1/4W Resis...

This is the Simple Ac line Voltage Announcer Circuit Diagram. The range of this simple ac-voltage monitor is 100 to 140 Vac, with a resolution of 1 V. The speech processor interprets an 8-bit binary input code from an analog-to-digital converter. The processor`s pulse-code-mod ulated output then passes through a filter and an amplifier before driving tbe circuit`s speaker to vocalize the corresponding number. Each time switch S1 is _pressed, the speech-processor program enun ciates tbe monitored voltage readings from 100 to 140 V, depending on the code at the input of a 27C64 EPROM.   Simple Ac line Voltage Announcer Circuit Diagram The voltage-monitoring circuit consists of a bridge rectifier, filter capacitors, and a 10-Kilload resis tor. A divider, RA and RB, limits the input voltage to a maximum 2.55 V. The aid converter, IC4, then sends the voltage reading to tbe 27C64 EPROM, ICS. Pressing Sl sends a negative transient pulse to the write, WR, input of the aid converter, I...

It will be easier to understand the operation of the circuit if we separate the under and over-voltage protection circuitry comprising transistors T1, T2 and associated components from the rest of the regulator circuit. Diode Dl arid. capacitor C2 provide 24V DC supply required to operate the relays.  Diode D2 and capacitor Cl provide the sample DC voltage for generating reference voltages for the cutout. For initial setting of cutout, collector of Tl is not connected to the base of T2. Also the time delay capacitor C4 is only connected after both under- and over- voltage points have been preset independently. Initially, due to the potential divider action of resistors R4, R6 and preset VR2, a voltage would appear at the base of T2. · lf this voltage is 0.6 ·V or more above the zener diode voltage of D4, transistor T2 would conduct, energising the relay and connecting the hot tap of the auto-transformer to the universal socket’s hot terminal through N/O contacts of the relay RLl....

This DC-to-DC AC Inverter Circuit Diagram uses no special components such as the torodial transformer used in many inverters . Cost is kept low with the use of cheap, readily available components. Essentially, it is a power amplifier driven by an asta-ble multivibrator. The frequency is around 1200 Hz which most 50/60 Hz power transformers handle well without too much loss. Increasing the value of capacitors Cl and C2 will lower the frequency if any trouble is experienced. However, rectifier filtering capacitors required are considerably smaller at the higher operating frequency. The two 2N3055 transistor should be mounted on an adequately sized heatsink. The transformer should be rated ac-cordingto the amount of output power required allowing for conversion efficiency of approximately 60%.  DC-to-DC AC Inverter Circuit Diagram

Circuit Diagram of 3000 watt power inverter 12V DC  to  230V AC Fig. 2: Sine-wave voltage and conventional square wave voltage with both 230 Volt rms   Fig. 3: Square wave voltage with duty cycle 25% for 230 Volt rms ("modified sine")   PCB Layout: 3000 watt power inverter 12V DC  to  230V AC Component Placement: 3000 watt power inverter 12V DC  to  230V AC fig.: output voltage with no load or inductive load. fig.: resistor 0,001 Ohm made of high-grade steel sheet metal Control electronics | 3000 watt power inverter 12V DC  to  230V AC fig.: control electronics on strip hole plate (previous version) and PCB of the "professional edition" Assembly of the mosfet-transistors on the heat sink | 3000 watt power inverter 12V   DC  to  230V AC fig.: heat sink, mosfet transistors, connections. Final assembly | 3000 watt power inverter 12V DC  to  230V AC fig.: 1500 VA inverter with 2 parallel transformers and 1000 VA inverter   Source: http...

This is a project of Simple Suitable AC DC Circuit Diagram. This circuit is simple, but very useful as well as simple and inexpensive. Its use is simple, when the positive (red) is connected to a positive voltage DC and the black lead on the negative, the red LED lights. Reversing polarities the Green LED lights. Connecting the ends to an AC source both LEDs will light. The lamp current is limited to 40mA LEDs @ 220V AC and its filament is illuminated with approximately 30V, shining more intensely with increasing tension. Therefore, due to the behavior of the filament, any voltage in the range of 1.8 to 230 can be detected without changing component values​​. Suitable AC DC Circuit Diagram D1 = 3 mm or 5. red LED D2 = 3 mm or 5. green LED LP = 1220V 6W NEON