RSS FEED IDEMS: Circuit Project Electronic
- Low Voltage Battery Monitor by LM339
This low voltage circuit can be used to monitor battery and other volatile sources of current for problems. The circuit sounds an alarm and lights an LED, but can be interfaced to any number of other circuits for many different uses.
Description
R1, R3 2 1K 1/4W Resistor
R2 1 5K Pot
U1 1 LM339 Voltage comparator IC
D1 1 [...]
Wed, 10 Oct 2007 11:14:36 +0000
- Top LM317 Regulator
I have circuit Regulator power supply by IC LM317 very many.
Regulator 1.25-30V 1A By LM317T(with PCB) ***Best***
DC Power Supply 1.25V to 25V
0-28V 20Amp By LM317 and 2N3055
LM317 Adjustable Regulator For batt 9V
2-30V 5Amp Power Supply Regulator With LM317,741,2SA1186
dual power supply 3V,5V,6V,9V,12,15V with LM317,LM337 ***Best***
Variable Dual Lab Power Supply by LM317 [...]
Mon, 08 Oct 2007 02:20:30 +0000
- Building Circuits (TTL to RS-232 level converter)
I recently had the need to connect a purchased electronics module which has a 2400 baud Serial TTL level (output only) interface to a PC’s serial port (difference between them is voltage levels). I could have just bought a converter, such as the “RS232 Serial Interface Module”, but thought I would have a go at [...]
Sun, 07 Oct 2007 01:52:23 +0000
- PC serial port buffer
This is a simple serial port buffer circuit I designed for a friend to speed up his SLIP connection in campus computer network “TRINET” of Helsinki University of Technology. The problem in the network was that the RS232 commections from rooms to terminal server were long and made of bad quality wiring.
The circuit is a [...]
Sun, 07 Oct 2007 01:44:32 +0000
- Curtain Control Circuit
Circuit : Andy Collinson
Email: anc@mitedu.freeserve.co.uk
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Description
This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains. Using switch S3 also allows manual control, allowing for curtains to be left only partially open or closed. [...]
Sat, 06 Oct 2007 04:19:44 +0000
- Automatic Headlight Brightness Switch
Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam headlights when there is oncoming traffic. It does this by sensing the lights of that [...]
Sat, 06 Oct 2007 02:47:31 +0000
- 13.8V 10A Regulatorby 7812 , 2N3055
The power supply circuit is shown in Figures 1 and 2. A 7812 positive 3-terminal regulator is used for the main regulation, and this is followed by as many power emitter followers as needed for the current you require. The transistors are not critical. I used 2N3771 devices (50V, 20A, 200W) simply because I had [...]
Fri, 05 Oct 2007 17:04:18 +0000
- Switching Regulator 0.5A by LM2574
The LM2574 series of regulator are monolithic integrated circuits that provide all the active functions for a step down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation.
Output Current 500 mA
InputMin Voltage 4 Volt
InputMax Voltage 60 Volt
Output Min 3.3, 1.23, 12, 15, 5 Volt
Output Max 57, 3.3, 12, 15, [...]
Fri, 05 Oct 2007 10:59:21 +0000
- Simple Stepper Motor Controller by 4027 , 4070
I found this circuit in my files. I don’t know where it came from, but it looks like I photocopied it from somewhere years ago. I have been told that it came from “The Robot Builder’s Bonanza”, by Gordan McComb. Anyway, I thought that it should be fairly useful, so I decided to post it [...]
Fri, 05 Oct 2007 00:52:25 +0000
- S-video to composite video adapter
This simple adapter can be used to convert Y/C video (S-video) to a composite video. This adapter is useful in cases where your video output device has only S-video output but your signal source accepts only composite video input. This circuit works with both PAL and NTSC video standards.
Y-ground——————+
[...]
Fri, 05 Oct 2007 00:34:38 +0000
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