임베디드랜드

Audio Indicator by 741

후니 유 — Wed, 16 Apr 2008 21:24:45 +0900

Audio Indicator by 741 This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator. If you need to monitor..

Low-Frequency Crystal Controlled Oscillator

후니 유 — Wed, 16 Apr 2008 21:23:28 +0900

Low-Frequency Crystal Controlled Oscillator The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to co..

Simple Bounceless Switch by 4011

후니 유 — Wed, 16 Apr 2008 21:22:04 +0900

Simple Bounceless Switch by 4011 My friend want circuit Bounceless Switch,in testing digtal circuit. This is Simple Bounceless Switch by 4011 ( hot IC) The bounceless output have logic digital,it control by S1. Detail more, Please read in this image cir..

Water Level Alarm by 4011

후니 유 — Tue, 15 Apr 2008 10:20:25 +0900

A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level of water in a bath or cold storage tank. This circuit will trigger with any fluid with a resistance under 900..

Atmel Solar Panel Battery Charger by ATtiny13V

후니 유 — Wed, 02 Apr 2008 20:32:02 +0900

Batwatch is a simple monitor for a solar panel battery charger, using an Atmel ATtiny13V. It periodically measures the charge current and battery voltage, and shows them by blinking two LEDs. I built this circuit into the plug of a VW solar charger pane..

Mini Flourescent Lamp Inverter

후니 유 — Wed, 02 Apr 2008 20:30:00 +0900

This is the typical circuit from a scanner that drives the flourescent lamp. There is also usually a 2KV capacitor in series with the secondary of the transformer to limit current, etc. They can be used as a general high voltage source for all kinds of..

12V to 24VDC Voltage Booster

후니 유 — Wed, 02 Apr 2008 12:20:26 +0900

This circuit will double almost any DC input voltage as well as handling plenty of current. 12 to 24V is just an example. With a few changes, it can also supply any desired output voltage. There are many possible applications. One I can think of would b..

14 Watt Compact Fluorescent Electronic Ballast

후니 유 — Wed, 02 Apr 2008 12:18:14 +0900

This circuit came from a 14 Watt Commercial Electric spiral bulb from Home Depot. It is very similar to a 16 Watt circuit on repairfaq.org. In fact, I drew it in that way because it was layed out very well, so much credit should go to Sam Goldwasser. As..

power supply 300V, 50mA + 6.3V, 3A max

후니 유 — Tue, 25 Mar 2008 21:57:53 +0900

This regulated power supply was built as a simplified outboard version of a PSU in my first phono stage. Replacing hexfreds with tube rectifier eliminates the need for power-on sequencing. Chassis (salvaged from a hospital laser PSU) size is 180W*240D*1..

LOW POWER 12,000 VOLT POWER SUPPLY

후니 유 — Fri, 21 Mar 2008 18:56:57 +0900

If you need about 12,000 volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line. Although the circuit..