View Full Version : Circuit Help
- DC motor spikes mess up chip
- op amp and photo diode
- Wireless Joystick / Circuit Help
- fet driver
- Replacement Capacitor
- Capacitors as timed circuit
- Power Supply with 12V and 10A or 5A
- Pulse Train Detection
- N channel high side switch
- 230ac to 5vdc
- Simple transistor circuit problem
- LM234 current source
- 4 quadrant speed control of brushed DC motor
- Low frequency Amplifer
- Lm317 help?
- Thyristor diagrams in wrong place or not?
- Opamp current measurements
- 9-16vdc in 12vdc out, product substitute, DIY
- Multi-voltage step down
- 555 astable circuit help
- Rock Boot
- Turbine to 12 V battery to USB port
- Resistance to trigger master-slave (240V)
- High Power Dual H-Bridge
- Could you help on interpreting part of a circuit?
- How to wire LED
- Why make it more difficult than it already is?
- High Frequency Preamp
- Wake Up Real Time Clock
- Constant Current Source
- Instrument amp circuit
- Why do crystal sets use diodes instead of transistors?
- SSR & contactor
- Transistors as switch
- Revolving light current - buck convertor
- Ionizer ion generation control
- Use a photoresistor to close a circuit?
- Convert 1ph to 3phase for motor
- How to wire a relay TX2-L2-3V
- Temperature Sensor
- Comments on this minimal amp?
- Inputs to regulators of a PSU
- Op-Amp Filter Circuit Transfer Function
- Automotive Turn Signal Flasher - Lamp Outage Detection
- Variable inductor instead of varible capacitor in FM crystal set
- long wire to transistor base
- Auto Window Up & Down
- 10 amp NPN Transistor switch circuit
- 220V voltage to digital voltage
- Low Voltage protection (cut at 33v - Full charged 44v)
- Counter 6-5-4-3-6-5-4-3... with D flips flops.
- small Speaker rating question
- Amplification of a dc current
- How to stop LEDs lighting at low current
- Capacitance touch switch using MOSFET
- transistor switch for LED's
- Diode in Relay Circuit
- Step down 12v to 6v
- Car Speaker LEDS
- Simple switching +-5v supply
- Solar Panel Project Help
- LED Project help, please?
- LM317L Voltage drop with load
- Quad Comparator Help
- Power on off indicator?
- Need help for simple LED circuit
- Powering a washing machine solenoid?
- PWM change frequency?
- Powering a motor and microcontroller
- LEDs and Thermal Resistance
- Help with wireless kit
- LNA Circuits
- Compression by the resistor
- diy logic probe
- Circuit help - Motor controller
- Mosfet cir.
- help with circuit design
- LED driver with current source bias supply?
- Simple way to salvage a car charger?
- LED timer
- 15VAC Dual adjustable regulated PSU 5V-25VDC
- Power distribution box (CCTV)
- IR phototransistor
- Power a relay with a zener diode
- Regulator help
- 3 wire RTD sensor reading circuit
- Radio controlled EMP?????
- For designing 50v,100v,150v dc power supply.
- Help required with placement of diodes on electromechanical vane display
- [Breadboard][Atmega8] Need Feedback on Circuit Setup
- Help Finalizing LED Boost converter
- LED arrays
- Demonstrating SEPIC capacitor overvoltage?
- 2 solar panels 2 battery packs
- Brewery Circuit
- need help on build 1 channel remote control
- POT range constraint
- Trying to identify this IC
- Need help with 24V and switch
- Need help finding a relay
- Simple power circuit question
- Audio/LED Circuit Help
- Stanford Research SR510 lock in amplifier circuits
- Simple off/on circuit help
- Flash gun circuit, Help!
- SMPS optocoupler feedback improvement?
- Need SS Design for Vibrator ckt
- Polaris RZR LED headlight wiring
- Op-Amp with bjt Design
- Transistor instead of relay
- Can anyone find a IC for this please?
- Tachometer circuit-need help
- DC voltage regulator
- regulator/ charger design
- Linear voltage regulator problem lm338
- Digital panel meters
- 7 segment led display
- PGA4311 bypass caps
- Diode Clamp to protect over voltage
- Frequency Multiplier
- CE Design question
- Minimal build circuit help
- Common-Base amplifier explanation?
- Audio level alarm - help please
- Trying to locate a 3.5mm driver
- Looking for oscillator and frequency divider schematics
- Inverting LM4780 circuit
- Circuit project - HELP - LED display, solenoid, Pic18F452
- BEAM 1381 solar engine problem
- Looking for a circuit design
- Dual 555 timer musical horn
- Capacitor Filtering on a battery supply
- How do I measure current on my motor?
- Fuel level warning lamp circuit
- 5v solar charger
- water pump
- Gradually switching a FET ON
- Danger from wiring to ground
- Non-inverting amplifier
- using a relay
- Which MOSFET do I use?
- 2 stage switch design using mono-stable multivibrator circuit. HELP!
- Limited Resistance Range on 500ohm Pot
- Amplifier Conundrum!
- Linear voltage regulator cooling
- Simple relay or more complex circuit?
- transformer
- Only one LEDs light up
- . .Need some Supply
- i need a binary or ring counter schematic
- Using phone vibrate mechanism to activate external device
- L78M05 5v regulator input
- Happ switch Illuminated button help
- dual rail supply and ground
- Batteries in series - charging and center tapping
- alternate led flasher ckt
- USB question
- Amplifier for unknown loudspeakers?
- Glowing from body heat
- need circuit for 12V 1.3AH lead acid battery charger
- Vreg heat issue and PCB power consumption questions
- Battery under voltage protection circuit
- MULTIPLEXER
- Should MOSFETs be open all the way?
- Lipo Protection Circuit
- help with potentiometer
- SMPS feedback loop is "easy"?
- Precision rectifier query
- Driving LEDs from 12V
- new project random number generator with memory
- Humidity Sensor Problem
- Variable Current and Voltage Regulator - LM317T
- Converting a security camera to be wireless
- Hall sensor ckt
- Help Making an RF controlled relay!
- Megajolt shift lights help please.
- Why the pull-up resistor is used with debounce buttons?
- DP4T, 4PDT or ?
- infrared linear actuator
- High power LED lighting
- Touch switch help!
- Oscillating SPDT Relay Help
- SEPIC LED driver..how measure Loop?
- Using an arduino relay brick to switch 120 ac volts / 5 amps safely
- Switching 500W load and LED
- Separate Loads turn off and turn on delay
- Latching Switching Time Delay
- simple amp output driver, need help designing one
- Help! Signal Inverter
- hall sensor - quiscent voltage
- Help with 19 LED VU Meter circuit (LM3915/16)
- wanting a solution to cockpit noise
- Trapezoidal Wave Generator Circuit
- 4N35+Capacitor+LED for PC Case
- relay help
- regarding capacitor values
- Help with non-inverting amplifier
- Accurate battery voltage sense (+/-30mV)
- nanowatt switch
- Simple Phototransistor switch circuit
- Power LED from USB
- Treble-Cut Filter Circuits
- SPW47N60C3 Switching
- Sensor Used to Light up an LED
- How to ignore pulses less than 700ns?
- How to build a wireless receiver for wireless PIR motion sensors
- Need Help with LM3410 12v LED Circuit
- Help with simple electronics circuit
- Replace a pot with a ¿resistor?
- Help with simple circuit/opamp project
- RF: active anti-resonance circuit
- Data Flip Flop Help
- Amplified Difference op-amp configuration questions
- Whats this Weird Circuit Symbol?
- conversion of gas concentration into 4-20 mA output!!!!!
- "Ratiometric analog output" interface with Arduino
- Amateur Help
- Common ground for different voltages in relay circuit
- dry uv film problem
- LDO heating up
- Newbie help with relay card
- powering a light from 2 different sources
- Coupled inductor SEPIC is wrong?
- OpAmp circuit
- need high freuency VCO desing
- GPS Transmitter
- Water pump controlled by sensor???
- Controlling Resistance With a Signal.
- do I need a circuit?
- LC Resonance
- Need help with jigging reel design.. what kind of diode to wire to motor?
- HELP: CCFL (LCD Backlight) Driving Circuit
- Wiring Voltage Regualtor
- Need help with oscillating PUT
- 2 transistors as SPDT?
- How to create your own Arduino shield
- IC Voltage Regulator Question
- Voltage help?
- Delay On Relay Wiring Help.
- PCB designer
- MOSFET Driver?
- how to connect max 232 to gps to get ttl output
- Hopefully a quick UPS question
- Complete newbie taking on a project need help!
- Not Sure How to Hook Up Power Supply to Motor
- Delaying an 'on' signal
- Please Hep with autobalancing motor project
- Diode I believe?
- Wiring keyboard print
- How do I prevent LEDs from dimming?
- Help with inverter
- Basic help - LM386 amp
- VFD
- [Help!] Having all kinds of issues with a simple project.
- SEPIC converter is too inefficient
- Switch on load only when alternator is running?
- UPS Project (uninterruptible power supply)
- ion detecting and electrostatic fields
- Securing the Load
- Confused by electricity!!
- Filter Questions
- Wiring in D15 Port
- Increasing output of fixed V-Reg
- Odd capacitor
- A simple fix
- purchasing a transformer
- converting input to a Jfet
- Odd scope waveform.....aliasing?
- Help with an R2-D2 LED Circuit
- Impulse Polarity Switch
- plasma speaker
- 3V to high voltage inverter
- Project Help
- DC-Voltage stepping up and down
- USB booster circuit
- Current limiting for transistor base
- Little Ups for my 12W Router
- Control systems
- Sign with 175 LEDs
- Noise Injection
- timer circuit stumper
- Mains powered SMPS.....Earthing?
- LED reduction Resistor
- Transistor Mosfet pairs to drive LED cube layers
- very simple question about car inverter
- Help with my first circuit
- converting rs-232 voltage to current in my circuit design
- Relay? help?
- simplest portable battery charger
- generating 50KHz sinusoidal current (test)
- Help to find specs of this transformer
- LED VU meter with transistors, dotted...
- signal impulse led indicator with hold
- automatic switch
- Newbie Missing Something
- Need a simplest wirless project
- Sorting things out with a small circuit
- 50KHz phase cut rectifier erratic...why?
- High-current SMPS LED driver
- High frequency PWM dimming of LEDs?
- Interfacing microprocessor and buckpuck LED driver
- Choosing power supply requirements
- Current problems
- supply voltage for the sensor
- Assistance with a LED array circuit
- help with a small project - precise 1rpm motor & circut
- Basic Circuit.
- Pyroelectric Infrared Sensor output
- Curious about the 4060 integrated circuit
- Autopilot switching
- High frequency current source lighting?
- Current transformer with phase cut rectifier?
- Rasberry Pi + Relay
- Power Supply for DC Motor
- Power supply
- Charging CAP to open PUT
- DWD - EP Multiwah footswitch
- NAND gate for LTspice?
- Custom I2C bus concept, would it work?
- Passive Averager and Current
- Switch mode LED driver...regulating I(in)
- How can I connect a remote controlled switch board to a motor ?
- Linear DC voltage inverter
- Confusing waveform driving PC speaker.
- Voltage Multiplier Design
- LED Controller
- click it branded dvr info and sofware
- Opamp GBW product and accuracy?
- Ohm's Law Conundrum
- Skin effect in 1 milliOhm resistor?
- Can't understand this, I got it right?
- 9v preamp for acoustic guitar
- New to electronics needs help - transistor switch
- Help with LEDs
- What is the live and neutral wire from a "1" and "2"?
- Question on power failure circuit
- Unipolar stepper motor question
- Basic resistor LED circuit question
- FM Radio circuit problem
- help with coupling components
- First Project / Post - Salvaged Resistive Touchscreen
- Audible sensor?
- Negative ion generator
- [URGENT][Eagle 6.3.0]Cannot open schematic!
- Question about crystal time base
- 3 phase engine Granulator automatic reverse Help
- Remotecontrolled AB-box. Help wanted
- build a sensor that can calculate distance between itself and sub sensors
- Wiring help
- Help: 18Khz+ Amp and Speaker Impedance matching
- automatic switch
- lmd18201
- TV Transmitter
- found a diy on Nintendo Candy Tin Portable Guitar Amp need help finding parts!
- Basic circuit battery help
- Simple 'Blink' Circuit / PCB
- Newbie Project
- LED Charging Indicator
- DC step up
- Hardware Debouncing Help
- Total amateur question.
- Can you ID this transformer
- designing ROV circuit
- Control circuit
- Battery Drainer Circuit
- LED insertion
- Analog signal to modulate LED intensity
- Help needed; analyze omron output plc circuit
- Can anyone make a remote controller
- Please help guyz..!! New to electrical circuits
- PPH1003 HELP
- assistance with modifying pc power supply
- Non-integrating low pass filter
- Circuit for lighting BL-T5/6W
- Beginner question: diodes?
- Need help with LED Circuit
- Adjustable Voltage Regulator
- Interfacing with machine counter
- Rectifying an audio signal
- Testing BJT Transistor
- RS232 - I2C converter for robot project?
- Voltage increase with arduino?
- Tachometer and frequency division issue.
- using MOSFET to drive sensor signal to PIC
- X360 Potentiometer Joystick + HT12D
- Passing signals with no current.
- Impact of Current loading for voltage multiplier
- Triggered Switch
- Voltage limiting without altering waveform
- SG3524 100v 25a smps
- collector coupled monostable multivibrator circuit operation
- Long Range Alert System
- Inductor/Capacitor wireless audio
- switching help please!!!
- Connecting a stepper motor to an Arduino board
- instead of optocoupler?
- 7912 Voltage Regulator problem
- dual axis solar tracking system project help needed..
- NiCd Battery Charger Schematic
- Question about circuit diagram
- PIC08 Circuit To Control 12v PC Fans
- how to cut off supply?
- Solid State Relays
- please help me with 4060 ic simulation on multisim 8
- help please!
- interfacing 3.6v flash memory to PIC microcontroller
- Can someone confirm the gain here please.
- [HELP] Optoisolators in series
- Model engineer needs help
- MOSFETs IN SERIES
- 4046 Phase locked loop problems
- won't work, right?
- 18dec to 5bin converter
- Electret Microphone - Activate LED's
- charging 2 independent batteries - solar
- Current transformer will saturate here?
- Constant off time mode possible for LED IC?
- through beam sensor and stepper motor to parallel port
- 4047/4066 audio slicer help
- UK Simple circuit, can anyone make it for me?
- Help me diagnose circuit problem
- Building a sunset dimmer
- Amplifiying 50KHz AC with Op Amps?
- Dimmer circuit help
- Will this blow up or work?
- Current source OK until load disconnected
- Will a 2kO resistor work?
- 555 Mosfet driver problems
- Why 0.1% resistors needed in opamp cct?
- Opamp current sense + peak detect is ok?
- Output low voltage of op amp?
- which power supply for my intervalometer?
- 12v fan speed control
- OS620 Circutry
- Need help with a Power Failure Alarm Circuit
- how to connect switch to led driver
- Automated DC or Stepper Motor Forward/Reverse/Brake
- Transistor and Voltage Comparator Question
- LED Expertise
- Reversing circuit help
- Pulse Circuit for Electronic Power Steering
- Voltage Drop
- analoge to PWM with a fixed 10 MHZ frequency
- How to get rid of these ripples in the current of LC circuit?
- How to give pulse to Mosfet?
- Fixed voltage circuit
- On/Flash/Off LED
- How to alternate 2 flip flops with 2 clocks?
- Current Limiting and Heat
- Led sequencer/scanner
- Constant voltage source from a battery
- DIY Electronics
- Monostable multivibrator
- component for Serial data
- looking to hire someone for a quick job
- differential op amp to measure current
- Voltage Dependent Resistor
- Controlling offset using VCR
- basic electronics question - help
- Battery charging regime for low charge rate?
- Adjustable double strobe LED circuit debugging
- Multiplexing Circuits
- LM2917 - to measure between 0 to 10Hz
- upgrading stardard pwm to more power
- Transformer Current
- Help with reading schematic
- driver or resistor for this high powered LED???
- 555 Timer Circuit and 4017 Decade Counter
- Limitations to analog dimming of NCL30105?
- LM35 fridge thermostat
- Sound Reactive LEDs
- bipolar stepper motor to parallel port
- For what value of L, will this circuit resonate at 332kHz?
- mosfet transistor for cordless drill
- Sallen key problem stability
- Operation of BJT in the circuit
- How to Convert 5V DC to 12V DC?
- Diode Clipper and LM386 questions
- LM358 op amp parameters...differential amp
- DC Booster IC
- Short circuit protection with differential amp?
- pummer circuit help
- 100 leds and 120v
- LED to light when battery drops below 3.5V
- Duncan amps PSU designer
- Problems with linear voltage regulators
- Abuse my LEDs?
- input 4 bit analog to USB output?
- Marine Aquarium Light Circuit Design
- Designing a sensor.....
- How to add a Li-Ion charging circuit to board design
- How do I build a headphone stepdown transformer circuit
- Need help with planning circuit :)
- Is Differential Amplifier badly inaccurate?
- Preventing overcharging from solar panel
- Could this circuit work?
- Using MOSFET for wireless Electricity transmission
- Simple 12v power on/off with non latch button?
- geiger counter prop
- Cool idea, but have no idea where to start
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