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Monostable to bistable relay with momentary switch – Circuit Schematic
Monostable to bistable relay with momentary switch
This circuit could be used to drive a monostable relay by a singol momentary switch. Powered by 24 Volts it works for a 12 Volts relay. When the button is press...
MOSFET Toggle Switching circuit – Circuit Schematic
MOSFET Toggle Switching circuit
This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is useful where the load needs to be switched on from one location a...
MOSFET Toggle Relay – Circuit Schematic
MOSFET Toggle Relay
This circuit is similar to the one above, but uses a N channel mosfet such as IRF530, 540, 640, etc. in place of the NPN transistor. Smaller mosfets could be us...
1000 Watt Thermostat controller – Circuit Schematic
1000 Watt Thermostat controller
Below is a thermostat circuit I recently built to control a 1300 watt space heater. The heater element (not shown) is connected in series with two back to back ...
Load detector Mains Switch – Circuit Schematic
Load detector Mains Switch
This circuit will automatically switch on several mains-powered "slave" loads when a "master" load is turned on. For example, it will switch on the amplifier an...
Logic-Level actuated gas solenoid – Circuit Schematic
Logic-Level actuated gas solenoid
Despite exhaustive searching, every reasonably priced solenoid valve for controlling propane during pushbutton start required 12VDC, beyond the capabilities of ...
Current sensing relay – Circuit Schematic
Current sensing relay
It operates by PWM (Pulse Width Modulation) - well, actually by PFM - Pulse Frequency Modulation. At power up, C1 charges up via D1 and R1. R2 will conduct, pu...
Touch Switches Collection – Circuit Schematic
Touch Switches Collection
Touch operated switches are an attractive project for DIY electronics but they are not so common in commercial products. The reason for this is that, although t...
Electronic 10 way Selector Relays – Circuit Schematic
Electronic 10 way Selector Relays
This is a circuit for alternative sources selection. It combines mechanical selection using a rotating switch S1, the electronic drive of the relays RL 1-10 an...
8 way electronic selector / switch – Circuit Schematic
8 way electronic selector / switch
The Elect. Sel. 8 is a simple circuit, with a choice of 8 sources of any sort ,of 8 independent switches. Each switch corresponding with a relay for example t...
8 input Relays circuit – Circuit Schematic
8 input Relays circuit
It is the essential continuity of circuits Sel 8 Sources and Up/Down Sel 8 Sources, but can work and autonomously, collaborating with any suitable circuit of co...
Signal and Tone Activated Relay Switch – Circuit Schematic
Signal and Tone Activated Relay Switch
In the Fig.1, exist a circuit, which is a sensitive switch that corresponds in AC signals of input, for signals above 5mV. Corresponds in all the signals from 5...
Touch Switch with relay – Circuit Schematic
Touch Switch with relay
A simple circuit with which we have the possibility opening and closing the RL1 contacts. He becomes touching a small metal surface. Clue of situation that is f...
8 way Up/Down Switcher – Circuit Schematic
8 way Up/Down Switcher
As with the Electronic sel. 8 we also have here a circuit with a choice of 8 different sources. The difference is that only two of the switches are used and the...
USB Printer Chooser Switch – Circuit Schematic
USB Printer Chooser Switch
With a DPDT switch, I can switch the two data lines. I tried connecting the shields from the two computers together, the grounds two computers together, switchi...
12V Relay Driver – Circuit Schematic
12V Relay Driver
Dual Channel Relay Board is a simple and convenient way to interface 2 relays for switching application in your project. Input - 12 VDC @ 84 mA. Output - two SP...
Touch Switch – Circuit Schematic
Touch Switch
The MPF102 (Q1) can be replaced with a NTE451 or ECG451, but still widely available. JFET-N-CHAN, UHF/VHF AMP. The 2N3565 (Q1/Q2) can be replace with a 2N2222(A...
Solid State Relay – Circuit Schematic
Solid State Relay
Solid State Relay Switch is a simple kit which will help you control (ON / OFF) a single high power circuit from a low power drive. Load - 24 to 240 VAC @ 500 W...
8 Channel LPT relay board – Circuit Schematic
8 Channel LPT relay board
Channel Relay Board is a simple and convenient way to interface 8 relays for switching application in your project. Input - 12 VDC @ 336 mA. Output - eight SPDT...
Mains Detector Relay with CD4017 – Circuit Schematic
Mains Detector Relay with CD4017
This circuit is operating the room illuminates. The basic component of the circuit is a IC1 (CD4017). Push buttons room are connected by normally wired to the c...