Single cell 1.2 or 1.5V LED inverter Joule thief circuit

The Shenzhen Skywave Semiconductor Co., Ltd. produces a five-flash integrated circuit controller known as M1500P. This device is manufactured using a DIP 14 standard package and can be customized according to customer specifications for soft seal packaging. It operates...

U2-a, U3, and R2 function as an integrator. Q2 and Q3 are alternately switched at 256 cycles. U2-b, Q4, Q5, and R8 through R11 form a constant current generator, with R11 configured to produce a symmetrical triangular waveform. The circuit...

This circuit consists of three single-junction transistor time relay circuits utilizing a pulse charging mechanism, allowing for extended delay times of up to several minutes. The first stage delay circuit incorporates unijunction transistors (VTi) and other components, where capacitor...

The finger, positioned within a light screen, is situated between a high-intensity LED emitter and a photocell. It generates a heartbeat signal that, when appropriately amplified, serves as the input for a PIC16F84 microcontroller. The microcontroller drives three common...

The 74AC240 stepper driver works by alternately enabling each half of the buffer. Only one half can be enabled at a time. Let’s assume that the top half of the driver is enabled. U1A & U1B along with R8,...

The 555 timer in bistable mode has fewer applications compared to its stable and monostable modes. Bistable mode refers to the circuit configuration based on the R-S (Reset-Set) trigger mode. An example of this is a micro-motor reversing control...