Constant Current Regulator with PWM /Dimming
Mini Switch-Mode Current-Driver (limiter) Modules
150mA (type A)                                             $2.25 (or less) 230mA ;  280mA ;  330mA ;  500mA (type B )  $2.25 (or less) 680mA (type C)                                             $2.55 (or less)
not rated $ 2.25$ 2.55 Select options
JouleThief style DC StepUp Converter 5v USB
Joule-Thief StepUp DC-Converter 5v-USB
An Essential tool for Renewable Energy , "Free-Energy" and Fringe-Science Experiments ! This circuit can convert the non-useful Sub-Volt electrical potentials into practically usable DC electrical Power.
not rated $ 4.50 Add to cart
555 Versatile Pulser Frequency Generator PCB
555 Versatile Pulser Module

This little PCB is a very versatile 555 timer circuit that can be easily adjusted for most any purpose that 555 Chip can be used for : Input current: >=100MA Output amplitude: 4.2V V-PP at 5v supply  ;   or … Continued

not rated $ 7.00 Add to cart
stepup-converter-6w
DC StepUp Converter Mini/USB 6W

These awesome little modules can convert a given input voltage to a higher output voltage up to 27v. For example – This can allow to run a 12v – 18v – 24v circuits from a single 3.7v Rechargeable Lithium Battery … Continued

not rated $ 6.90 Add to cart
5A CC / CV Regulator / Driver module
5A PWM Regulator CC/CV

5A ConstantCurrent & ConstantVoltage REGULATOR (with Adjustable Current & Voltage) XL4005E 300kHz PWM DC-Converter Input: 5v-32v  Output: 0.8v-30v Hi-Efficiency, LowDropOut:0.6v

not rated $ 12.90 Add to cart
10A Varible Power /Speed Controller
PWM DC-Power/Speed Controller 10A 12-40v

This DC Power Controller can be used as an efficient DC Regulator with a Variable Power Output. controlled by a potentiometer knob from 0%-to-100% Power Output. 10A Maximum Current Output 12v to 40v Maximum Input Voltage 400W Maximum Power 20mA … Continued

not rated $ 13.50 Add to cart
Simple Long-Delay Timer Module
Long-Delay MosFET mini TIMER SWITCH

Versatile TIMER SWITCH PCB – 2A , 20v Mosfet, Long Delay ON-Timer Circuit Delay time preset-able from several minutes (seconds) to several hours… Push the button and it will stay ON for a preset amount of time, then will turn-OFF … Continued

not rated $ 9.90 Add to cart
3-in-1 DC Power Converter for Universal DC Power Bank
3-in-1 Universal DC Power Converter PCB
This Very Handy 3-in-1 Power Converter includes : 100w Step-Up(Boost) Converter for 19v Laptops (adjustable from 12 to 36v) 30w Step-Down(Buck) Converter, set to 9v but can be adjusted down to 1v 15w Buck Converter for 5v USB port capable of supplying up to 3 Amperes Also a direct output from the 12v battery which doubles as a charging input
not rated $ 24.00 Add to cart
PIR Motion sensor /detector module
PIR Motion Sensor Module
HC-SR501 (DSN-FIR800)  Human presence sensor detects the presence of a moving human (& large animal) bodies in a wide field of viewing angle. PIR Detectors are commonly used in Security systems and Automation. This module comes with 2 onboard trimpots for adjusting both -  the sensitivity and the dwell time- or the amount of time the output stays active since the detection was triggered.. Importantly - this sensor can stay ON while the motion is detected and will not switch itself off at every interval. The module has 3.3v Logic level output and can be used directly with Arduino and similar various MCU development boards and robotics projects.
not rated $ 11.50 Add to cart
IR-Optical Proximity Detector 50NK
IR-Beam Optical Proximity Sensor 50NK

5V , 2-to-50cm* adjustable infrared proximity sensor, C38-D50NK

This compact sensor module can detect objects in the reflection path of it's Infra-Red beam - within about 2 to 50cm or more if reflective surface is used such as bicycle visibility reflector for example. The beam is modulated with the module's native code to ensure that other light sources don't interfere with accurate beam detection. The sensitivity and detecting distance can be adjusted via the on-board poetentiometer. There is also an onboard LED indicator to provide a visual clue of sensor's triggering. These modules are very useful in various Robotics / Automation and Security systems applications. DC supply : 4.5-5v Operating Current: 10mA Output Signal: TTL-Logic Level (~4.5v) Output Current:  100mA (max.) dimensions:  31 x 25 x 13 mm
not rated $ 20.50 Add to cart
mini volt meter module
mini digital DC Volt-Meter

Miniature 3-digit DC Voltage indicator Red LED 7-segment indicators . This volt-meter module derives it’s power directly from the source that it is measuring. only 2 wires to connect : Plus and Minus. Maximum safe measured voltage : 30v Minimum … Continued

not rated $ 7.50$ 8.10 Select options
Stepper Motor Driver PCB L298N
L298N Stepper Motor Driver H-Bridge 25w

5v Logic Inputs Drive voltage: 5~35V Drive current: 2A (Max. single bridge) 43x43x27mm 26g

not rated $ 9.99 Add to cart
14-18w Mini, Mono Amplifier module
14-18W mini Mono Power Amplifier PCB

the Popular TDA2030 Integrated Power Amplifier IC allows to build a very good performance power amplifier within a  fairly simple and compact  PCB.  This little module can typically pump out about 14 watt of power and up to 18-20 watt … Continued

not rated $ 10.50 Add to cart