These are transformerless power supplies that can feed 5V circuits with current consumption ranges from 20-30 mA to 80-100 mA. Check the C or R values and the configurations.
You can simulate to measure supplied voltage and current. The model for Zener diode is on schematics for it.
Change values and get your needed output current.
The bridged capacitive version worked fine for a 50mA circuit...

A collection of analogue effects processing circuits.
These are simulations and not complete designs but will take relatively little work to turn into finished designs that can be transferred to PCB.
More work is required on things like the input buffering, pre-amplification and gain or tone controls, output buffering and mixer stages and power supply (the simulations are all based on a split +...

A schematic-only project to demonstrate how a bootstrap capacitor works. The overall circuit is a DC to DC Buck converter (see [Buck converter, from Wikipedia](https://en.wikipedia.org/wiki/Buck_converter)):
- The control signal is a 20kHz, 50% PWM wave.
- The power source is 12V DC.
- The MOSFET is a N-Channel, requiring a positive voltage between gate and source of at least 5V.
To simulate it,...

Simulating the Vishay Si2301CDS-T1-E3 (digital p-channel MOSFET)

The equation for the switching frequency for the L4978 given on page 3 of the AN1061 Applications note:
DESIGNING WITH L4978,
2A HIGH EFFICIENCY DC-DC CONVERTERY
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00004056.pdf
is wrong.
The notes in this analysis derive an exact equation and a close approximation that should be accurate eno...

Examples of the various functions available in EasyEDA.
Some of the functions are built-in functions of ngspice. Some are EasyEDA implementations of new functions or are functions that that improve on the ngspice versions in some way, such as improving convergence, are more reliable in simulation, are more widely applicable in expressions and B sources or are just easier to use.
Note that, unles...

Simulations of simple shunt voltage regulator circuits to regulate the rectified output of a permanent magnet alternator such as may be found on many motorcycles.
Several variations of the basic circuit are possible.
*Please note, however, that not all variants are illustrated in this project*:
1. Using a bipolar power transistor as the shunt regulator element. Suitable for low power alte...

Demonstrating the effect of dv/dt turn-on in a Thyristor.
For a Thyristor or SCR in the non-conducting state -
even with the gate tied to the cathode - as the rate
of change of voltage (dv/dt) across the anode and
cathode terminals exceeds the datasheet specified
maximum value (in this case 30V/us), the device will
turn on.
A similar effect occurs in Diacs and Triacs.
To run t...

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