Touch switch circuit fabricated by 555 time base circuit

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

One-piece inductor

The following figure shows a specially designed touch switch made of 555 time base circuit. It has only two external lead wires, so it can directly replace the ordinary switch without changing the power wiring. The EL is an incandescent lamp or an AC contactor of no more than 25W. The left part of the dotted line is the ordinary lighting line, and the right part is the touch switch circuit. When the IC is in the reset state, the 3 pin outputs a low level, and the gate of the thyristor VS is clamped at a low level through the resistor R3, so the VS is turned off, and the EL is not lit. At this time, the working power of the 555 is 220V AC light EL Diode VD1 ~ VD4 rectification, resistor R2 current limit, VD5 voltage regulation and IC1 filtering to obtain about 6V DC working voltage supply. When the 555 time base circuit 2 pin is triggered, the IC3 pin outputs a high level, VS turns on, and EL lights up. After the VS is turned on, the 555 working power supply directly forms a loop from the lamp EL, the diodes VD1 to VD4, the thyristor VS and the voltage regulator VD5, and the 6V DC working voltage can still be obtained at both ends of the C1, but the resistor R2 does not function at this time.

Touch switch circuit fabricated by 555 time base circuit

600V DC Electronic Load

600v DC Electronic Load can be switched quickly between different values in the same operating mode, including CC dynamic mode, CV dynamic mode, CR dynamic mode and CP dynamic mode, CC/CR high speed dynamic mode up to 50kHz. This function is suitable for transient test of power supply, test of battery protection characteristic and battery pulse charging etc. Dynamic mode test has continuous mode, pulse mode and toggle mode.

Additionally , programmable DC electronic load can also have 200V DC Electronic Load and 1200V DC Electronic Load for more options.

kindly check below features for your reference:

● Flippable front panel and color touch screen allow convenient access and operation
● Provides four kinds of basic working mode such as CV/CC/CR/CP, and CV+CC/CV+CR/CR+CC complex operating modes
● Adjustable current slew rate, adjustable CV loop speed
● Ultra high precision voltage & current measurement
● OCP/OPP testing function
● 50kHz high-speed CC/CR dynamic mode
● 500kHz high-speed voltage and current sampling rate
● Timing & discharging measurement for batteries
● Short circuit test mode
● Auto mode function provides an easy way to do complicated test
● Dynamic frequency sweep function for determining worst case voltage peaks*
● Non linear load mode function makes the simulated loading current more realistic*
● Supports external analog control function*
● V-monitor/I-monitor
● LED load simulation function
● Full protection: OCP, OPP, OTP, over voltage and reverse alarm
● Up to 20 units master/slave parallel control
● Front panel USB interface supports data import and export
● SCPI language and standard rack size make it ideal for ATE System integration
● Smart fan control with lower noise and better for environment
● Multi versions to meet the cost performance and different applications
* Only professional Electronic Load units support these functions

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APM Technologies Ltd , https://www.apmpowersupply.com