Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [dpdt]

Used to describe a Double Pole Double Throw relay (usually 8 terminals).

A Double Pole Double Throw (DPDT) relay has two rows of change-over terminals. Equivalent to two SPDT switches or relays actuated by a single coil. Such a relay has eight terminals, including the coil. Commonly used as a transfer switch between two power supplies or two loads.

86 questions
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Control 16 motors with 8 relays

I build a project using 8 relays in a matrix (charlieplexing) to control 16 motors (actuators), plus one relay to control two DPDT relays to reverse the power for the motor to turn reverse. I only need to run one motor at a time. When testing it i…
Kim HJ
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Harvesting energy from old batteries?

Old batteries (I mean AA, AAA -sized 1.5v ones) usually have some residual energy, which can be used, for example, to charge mobile phones/pads. I have seen some schematics on the Net, but all of them try to connect old batteries in series without…
Roman Susi
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Analog switch with a fixed state when not powered?

I am looking for a chip that could handle DPDT (or SPDT, or ultimately SPST) analog switch for audio routing (in the mOhm range resistance) and can guarantee one state when there is no power supply. I have been looking around in manufacturer…
chillyjee
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dpdt switch to spst switch

I am trying to build a raspberry pi gameboy emulator with a custom board inside of a gameboy adv sp shell. I decided to use an open-source board made by some guy on the internet and I will be modifying a few things on the board such as the power…
Vincent Pipitone
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Do these two DPDT relays function the same?

If I do a search for a DPDT relay with 120VAC coil voltage, 30A and 220/240VAC contact rating as the parameters, I get results that look somewhat like the 2 examples listed below. What is it that sets them apart functionally? What am I looking for…
Shawn G
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Electrically Controlling A motor direction

I want to control a motor's direction electrically. When the input is a zero, I want it to go one way, and a 1, the other way. The only way I can think of this is a solenoid with a spring attached to a DPDT reverse switch wired to the motor, so when…
skyler
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Feed protection to the Mosfet drains

I have a machine running three 12v solenoid coils. Currently, control is carried out by manual switching of the negative through SPDT toggle switches. The coils all have a positive 12v common. I am wanting the ability to additionally control the…
Jacob Goona
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How to wire a Rpi, a relay, a DPDT and a PWM module to a DC motor, allowing to control its direction and speed?

I am currently using a Raspberry Pi to control the speed of a 12V DC motor and it works perfectly fine right now like this: This works: I can start, stop and ramp up the DC motor speed. But obviously, it only goes in 1 direction and it cannot spin…
that-ben
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H bridge using DPDT relay

I have a DPDT relay and I would like to create a H-bridge. How do I implement a H-bridge with a DPDT relay?
user222037
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Snubber diodes for a DC Motor with 2 relays

simulate this circuit – Schematic created using CircuitLab Description: RLY1 relay switches 12v on or off. RLY2 changes direction of current flow to the motor. I have flyback diodes on RLY1 & RLY2 coils. The relays are switched by an Arudino…
Squats
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UPS Circuit - Unexpected Inverter Death

I've been trying to build a high capacity UPS with a deep cycle marine battery, 300 W inverter and a Double Pole Double Throw relay. The relay switches the power source from mains to the inverter during a power failure. The system worked fine for a…
Jetkov
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Digital equivalent of a double-throw switch?

I'm designing a circuit that would switch between stereo-jack inputs. Source audio would be plugged into one end, and on the other two ends, two different audio outputs. I want to be able to switch between one of the two outputs. Physically, I know…
cdahmedeh
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Circuit for a DC motor with 2 microswitches reversing direction

So here is what I am trying to do... have a DC motor wired to an on/off switch and 2 microswitches. Each switch will reverse the direction of the motor, so one switch tells the motor to go forward, the other tells the motor to go reverse. My goal is…
Adjit
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Best way to implement bypass circuitry for analog crossover filter circuit?

Below is a system block diagram of a schematic / PCB I am working on. It is an SOC with two differential audio DACs (left and right audio channel). Each channel has a fully differential cross-over filter, with the high-pass filtered outputs going to…
zigzidane
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Can't find suitable Bistable/Latching 12V DPDT Relay

I have a 12V actuator that is controlled by a 12V programmable timer. So my pulse is either power or no power. I am using a regular 12V DPDT relay which works fine. However, I would like to use a Bistable relay so that I can turn off the power…
ToWi
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