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power Switching Between Two Voltage Supplies – Circuit Schematic
power Switching Between Two Voltage Supplies
VOUT to be 3V when the switch is open and 5V when the switch is closed. The simulation seems to give me what I want when the switch is open, but not when it`s c...
mosfet or transistor for using as switch for audio signals – Circuit Schematic
mosfet or transistor for using as switch for audio signals
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Using a triac to switch audio signal for laser maze – Circuit Schematic
Using a triac to switch audio signal for laser maze
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What should I take in account when using a more powerful triac – Circuit Schematic
What should I take in account when using a more powerful triac
The resistance of my heater is made of 9$Omega$ 3mm diameter nichrome wire. On 240V(rms) voltage this makes 25A(rms) current. I have an access to a mains line c...
Mixing AC and DC power in a circuit – Circuit Schematic
Mixing AC and DC power in a circuit
Control a furnace using a 3. 3V microcontroller. The furnace operates by connecting a common 21V AC "hot" line to one of two AC "neutral" output lines: Fan and ...
Solenoid Driving Circuit – Circuit Schematic
Solenoid Driving Circuit
The solenoid requires a certain amount of current to generate its magnetic field. If the solenoid was a perfect inductor, the DC current would rise above all me...
mosfet Reverse polarity protection – Circuit Schematic
mosfet Reverse polarity protection
When the reverse voltage is applied that is say 10V to Source and the drain is grounded. So now the Vgs is -10V which is well above the threshold and is good en...
How to Wire This Latching Relay – Circuit Schematic
How to Wire This Latching Relay
Switch a water solenoid valve using two water level switches, one will be placed at the top of a tank and will be NO (when water level is between full and empty...
Solid State Switch for magnet DC Generator – Circuit Schematic
Solid State Switch for magnet DC Generator
Using a flywheel-driven permanent magnet DC generator to charge up a bank of supercapacitors, 35 farad rated to 25V. For safety I limit the max charge to 22V vi...
switches Wiring a SPDT Relay – Circuit Schematic
switches Wiring a SPDT Relay
A SPDT switch that simply switches the relay over. Any pointers would be appreciated. When I currently energize the relay, I hear it cycling, which I would imag...
power How can I switch a high current with a low-rated switch – Circuit Schematic
power How can I switch a high current with a low-rated switch
Designing and building a breadboard power supply for myself, which draws power from an ATX-like SMPS (Mains in, single Molex plug out) via a 4-pin Molex connect...
relay How can i drive a 5v 120VAC 80mA with 15A contacts with a raspberry pi – Circuit Schematic
relay How can i drive a 5v 120VAC 80mA with 15A contacts with a raspberry pi
Drive a latching relay that needs about 70-90mA if the raspberry pi can only deliver about 40mA. I need to find a relay that can handle home appliances but can ...
Undervoltage lockout for small-power MOSFET gate driver – Circuit Schematic
Undervoltage lockout for small-power MOSFET gate driver
Developing a battery switch-over circuit which is made of two lanes of the depicted circuit. Operation voltage range is from 3V. 12V. Only one lane should be en...
ac Validate Triac circuit – Circuit Schematic
ac Validate Triac circuit
The heatsink on the triac is a bit unclear for me. I`ve calculated a maximum value of 10C/W, is this fine My calculation is: (max temp - room temp)/(max on stag...
opto isolator Optotriac+triac: how do I calculate the gate resistor – Circuit Schematic
opto isolator Optotriac+triac: how do I calculate the gate resistor
Building a small circuit to turn on/off a 200W heater. I am using a MOC3023 and a BT136. At the datasheet of the the optotriac, this circuit is recommended: My ...
pwm Why is the MOSFET driver in this circuit dying – Circuit Schematic
pwm Why is the MOSFET driver in this circuit dying
The circuit takes Vin, passes it through a SMPS with two MOSFETS (driven by the ir2104 that dies) and into Bat+. The LM321 is just a latch that allow the MCU to...
power MOSFET on/off switch -- asking for critique – Circuit Schematic
power MOSFET on/off switch -- asking for critique
A "power button" that is actually two buttons; one on, one off. This needs to switch on the order of 15 V and up to 10 A, for a LiFePO4 battery powered device. ...
voltage MOSFET Switch w/ Fast Settle Time for Switching E-Field – Circuit Schematic
voltage MOSFET Switch w/ Fast Settle Time for Switching E-Field
I have a copper mesh (10cm x 10cm square) in a vacuum chamber connected to a BNC connector by a 24-cm-long copper wire. The goal is to switch the mesh voltage (...
relay In a circuit being switched by an NPN transistor do power supply and input need the same ground – Circuit Schematic
relay In a circuit being switched by an NPN transistor do power supply and input need the same ground
Make a circuit that will allow me to switch on a relay that will turn on an LED. However, the relay is rated for 12 V, and I only have an input of 5 V, so I`m u...
switch mode power supply What does frequency foldback do in a switching regulator – Circuit Schematic
switch mode power supply What does frequency foldback do in a switching regulator
When VOUT is very low during start-up or a short-circuit fault on the output, the switching regulator must operate at low duty cycles to maintain the power swit...