500W inverter

500W inverter smalll pic

MOSFET prevents battery damage

Power circuit diagram - MOSFET prevents battery damage
	In this condition, the transistor gets forward-biased, which switches on the MOSFET. 2. Santosh Bhandarkar, Wep Peripherals, Mysore, India
The MOSFET conducts only when the battery is correctly connected, which lets the battery charge or discharge.

Convert negative inputs to positive outputs

Power circuit diagram - Convert negative inputs to positive outputs
	Voltage divider R1/R2 at IC1’s output provides feedback that sets the output voltage 10.5V above IC1’s ground pin. Shane Chang and Budge Ing, Maxim Integrated Products, Sunnyvale, California
You can obtain a precise, positive-output voltage from a negative-voltage supply with a boost converter and a linear regulator.

Solar-powered sensor controls traffic

Power Circuit Diagram - Solar-powered sensor controls traffic
	The Cap Drive pulse discharges this capacitance at a 700Hz rate, and a 100k? resistor charges it to 3V with a 240-µsec time constant. Larry K Baxter, Capsense, Lexington, MA, USA
This Design Idea describes the TSP (traffic-sensor post), a more accurate, effective, inexpensive, and easy-to-install approach to monitoring traffic flow.

Battery simulator has variable ESR response

Power Circuit Diagram - Battery simulator has variable ESR response
	IC1 supplies a stable voltage, setting the unloaded output voltage. IC2 provides the necessary inversions for the ESR function. Barry Galvin, Grae LLC, Simi Valley, California, USA
The circuit simulates most battery types, including lithium ion and alkaline. It supplies 0.5 to 4.2V at several amperes to the device under test, and it can simulate the ESR of a variety of battery types.

any high side overcurrent-protection circuit

Power Circuit Diagram - Inverted regulator increases choice and reduces complexity
	R10 and R12, both 0.33O, 1W resistors, provide current sensing for the two phases. David McCracken, Aptos
A simple approach for any high side overcurrent-protection circuit references the entire circuit to the high-side rail.

3 and 30V power 3amp

This power supply is meant as an auxiliary or as a permanent power supply for all common circuits based on a stabilized DC voltage between 3 and 30V provided that the consumption does not exceed 3A. Of course this power supply unit can also be used for other purposes. Be replacing the trimmer by a potentiometer, it may even be used as an adjustable power supply unit. A good quality heatsink must be used.
Circuit diagram:

3 TO 30 Volt 3 Ampere DC Power Supply Circuit Diagram

Parts list:

R1 = 8.2K
R2 = 2.2K
R3 = 680R
R4 = 1K
R5 = 82K
R6 = 0.18R/5W
C1 = 470p
C2 = 100nF-63V
C3 = 100nF-63V
C4 = 100uF-63V
C5 = 10KuF-60V
D1-D6 = 6.6A
Q1 = MJ3001 (Darligton)
IC1 = UA723D

Specifications:

• Overload protected
• Sshort-circuit stable
• Output current: max. 3A
• Output ripple voltage: 0.5mV
• Output voltage: adjustable from 3 to 30V, stabilized
• Input voltage: 9 to 30V AC (depending on the desired output voltage)