BatchPCB FAQ. Questions Answers What is this place? We run on a pretty simple concept. You submit your PCB design, we add your design to the batch of orders. When the batch is big enough (usually around 2-3 days), the batch is set off to be manufactured. 10-14 days later, the individual boards are received by us. We then split the orders up and mail your order to you. Please Note: Not all panels are sent back from the manufacturer in the same chronological/numerical order that they were sent out in.
Please Note: 4 layer boards take a little bit longer to receive back than the 2 layer orders and they cannot be expedited. 4 layer boards should be ordered on a separate order from two layer boards (since we have to ship them separately). You can get as few as one board. Please remember that these are prototype PCBs. Be sure the preview your gerber files before submitting. Expediting Your Order : Expediting your order changes the lead times from 2-3 weeks to 1- 1 1/2 weeks. What are the PCB rules and limits? Lecture 8 - Eagle Schematics.
Welcome to the wonderful world of PCB creation! We've used a few software packages over the years (namely Protel DXP) and have found Eagle Layout Editor from CadSoft to be very easy to use, very cost effective, and very powerful. Eagle is free! There are some limitations in place, but basic students and non-profit groups can use it. Protel is currently about $12,000 a seat. Eagle is not the 'hobbyists' tool you may think it is. There are a few files that you will need to download for this workshop. Download Eagle itself. Note: The SparkFun Eagle shortcut key script file has an .scr extension. To learn how to use Eagle, we are going to create a simple breakout board for a popular USB IC. What is a USB to TTL converter? Once the FT232RL is attached to the USB port on your computer, you will need to install some simple drivers (available for Windows, Linux, Mac), and then you will see a Virtual Com Port (VCP) appear on your computer.
This is a bare-minimum feature setup for the FT232R. PCB's on the cheap. Decent PCB's on the cheap. Version .2f (original 2003) Dal Wheeler Questions / Comments Email Me! New! Pictures of my business trip to China (6/2006) I've experimented with many home fabricated PCB methods. Toner transfer has been around for a while. 1. Basically use anything that you are comfortable with. 2. Use a gerber file viewer utility to load your newly created images. Printing from within this program as opposed to the layout software also has the nice side-effect of not having the holes included on the copper pads, giving you a little more copper / fudge room when you drill out the board later. On double-sided boards, print the bottom layer, cut out the image leaving 1-2" on one side to allow you to bind the top and bottom together.
. * Some have written me asking about the magazine stock that I have been using. 3. Clean off the oxide layer with a green kitchen scrubby. 4. 5. Fill a small bowl with luke warm water and a little dish soap. Laser listening. By: The codex: Use a light beam to listen in to anything, anywhere, any time... Breaking and entering to plant a listening device is one way to "bug" a room. Unfortunately, it can earn you a long jail term. A safer way to bug a room is to use a laser beam to eavesdrop on a window from across the street...
This data is presented for information purposes only... The laser listener... The sound waves generated by nearby conversation will cause the glass in a window to vibrate very slightly. All that's needed to hear what is being said is a demodulating device that extracts the audio from the reflected laser beam That technique is used by sophisticated "surveillance experts," but you can easily duplicate that feat by using a hobbyist's laser and the inexpensive Laser Listener demodulator shown in Fig. 1. If you need something a little more sophisticated it can be made part of the riflescope aimed laser-bug system that is shown in Fig. 2. Class I: Low-power beam. Testing. A $16 pocket spectrum analyzer. ShmooCon was, once again, a fantastic experience this year. One of many highlights of this year's event for me was hacking on some radio devices with Travis Goodspeed in the hotel bar for hours on end.
This included playing with the IM-Me that he brought. As soon as I got home I ordered one. I found mine for $15.99 and free shipping on eBay. Since then I've written custom firmware to turn my IM-Me into a pocket spectrum analyzer, shown here displaying activity of a frequency hopping system at a grocery store. The software tunes the IM-Me's radio chip to one frequency at a time, uses the chip's RSSI measurement function, and plots the result as one column on the LCD.
The frequency ranges supported by my device are 281 - 361, 378 - 481, and 749 - 962 MHz. The software supports three bandwidth modes: wide (default), narrow, and ultrawide. The code is open and available here. Mini audio analyzer. Ο αναλυτής αυτός είναι , ένα ευαίσθητο όργανο , στις μεταβολές συχνότητας και πλάτους, ενός ακουστικού σήματος. Έτσι η φωτεινότητα των LED που ανάβουν κάθε στιγμή είναι ανάλογη του πλάτους του σήματος, ενώ το χρώμα αναλόγως της συχνότητας.
Η ευαισθησία του κυκλώματος εισόδου ρυθμίζεται με το ποντεσόμετρο R2, ώστε σε ισχυρά σήματα να ανάβουν τα κόκκινα LED, στα μέσα τα κίτρινα LED και στα χαμηλά τα πράσινα LED. Η μονάδα απεικόνισης αποτελείται από 3 σειρές των 10 LED η κάθε μια, οι οποίες ελέγχονται από ένα απαριθμητή αποκωδικοποιητή (IC2).
Δυο πύλες IC3A-B, λειτουργούν σαν πολυδονητής για τον χρονισμό του IC2, με το R6 ρυθμίζουμε την συχνότητα . Όταν δεν υπάρχει σήμα στην είσοδο, τότε κανένα LED δεν ανάβει. This analyst is, a sensitive instrument, in the frequency changes and width of a acoustic signal. Audio circuits. The following links to circuit diagrams and building projects I have found from other web sites. I have tested only very few of them so there is no guaratee that those circuit will work as expected.
I don't have more info on those projects than what you can download from those sites which have the circuits. If you have more questions about those circuits then please mail the questions directly to the person who has designed the circuit or to the people responsible for those web pages. Andrea's projects - circuits and documentation Audio circuit at Digital Music Zone - compressors, effects, preamps, microphones, phantom power Digital Music Zone Schematics - compressors, microphones and effects DIY Audio pages Low power ( High power (>30W) Professional audio amplifier circuit diagrams Application notes and datasheets Cool Audio - Harris application note on PWM amplifiers Input Output Input and output in same circuit Other circuits Filters and effects Equipment modifications Misc Misc circuits Home .
Limiter. Important! New version of this circuit exists. Click here! Why it is important to use a limiter? Audio signals as music or speech have big dynamic ranges. Following circuit is the simplest limiter possible. Technical specifications Supply voltage: 10-14 V stab. Output voltage vs. input voltage (with C8 placed) Schematic diagram Parts list Resistors: R1 - 68 k R2 - 22 k R3 - 180 k R4 - 10 M R5 - 10 k R6 - 47 R R7 - 240 k R8 - 1,5 k R9 - 820 R Capacitors:C1 - 100 p (ceramic) C2 - 1 n (plastic) C3, C6, C12 - 100 n (ceramic) C4, C11, C13 - 100 u (electrolytic) C5 - 0,33 u (tantalum) C7, C8 - 10 u (electrolytic) C9 - 220 n (plastic) C10 - 47 n (ceramic) C14 - 470 n (plastic) Misc.
Don't place the C8 if you don't want to use whole dynamic range. PCB layout. CZ Compressor/Limiter/Clipper for FM broadcasting. Why is it important to use this device? Audio signals as music or speech have big dynamic ranges. There are silent and loud sections. These audio signals aren't too good for a transmitter, which requires audio signal with constant level on the input. Limiter is a device, which weakens loud signals and intensifies silent signals. If your transmission chain does not include any similar device, you should build this one. Be careful if you want to buy any simple compressor/limiter board available on the market!
Characteristics: Absolutelly no signal overshooting (tested with PIRA75 FM Broadcast Analyzer) Low noise and distortion Simple to adjust Only a few parts to solder Precise preemphasis including HF clipping with no distortion audible Stereo version available here Schematic diagram: Part list: R1, R3 - 10kR2 - 1kR4, R5 - 1MR6 - 18kR7, R8, R15, R16, R17, R19 - 33kR9 - 1M5R10, R12, R14, R18 - 470RR11 - 270RR20, R23, R25 - trimmer 5kR21 - trimmer 5MR22 - trimmer 1kR24 - trimmer 500R Top side.
Audio limiter circuit schematic. Clipper. Single Op-Amp Twin-T Band-Pass and Notch Filter | Simple Circuit Diagram. This is a Single Op-Amp Twin-T Band-Pass and Notch Filter circuit. This circuit uses the twin-T topology which requires one or two op amps and three resistors and three capacitors. That’s mean this topology based on a passive (RC) topology. It is not difficult to match the six passive components, but it is critical. we can use single value of capacitance and a single value of resistance to create C3 and R3.
Here is the schematic diagram of the circuit: The component values are determined by following equation: Bandpass configuration: C1 = C2 = C R1 = R2 = R R3 = R/2 C3 = 2C Fo=1/(2pRC) R4 and R5 are used to control gain with R4>100*R5 Notch configuration: R1 = R2 = R C1 = C2 = C R3 = R/2 C3 = 2C Fo = 1/(2pRC) R4=R5:HIGH If the components are matched too closely, the bandpass circuit will oscillate. Selecting the resistor to virtual ground to be one E-96 1% resistor value off will de-tune the bandpass circuit slightly. Gijs's Personal Home-Page « Gieskes.nl.
Circuit Symbols of Electronic Components. A new multi-function power supply unit for my Embedded Lab. One important parameter in embedded system designing is power consumption. This parameter is directly related to the battery lifetime, if the system is to be powered from a battery. In order to determine the power rating of your designed system, you need to know how much current the system draws from the source at a given voltage. While working on my projects, I usually measure current by placing an external ammeter in series with the current’s return path. This is not always convenient to do, and so I thought of making a special power supply unit for my lab that would display both voltage and current information on a LCD screen while prototyping my circuit.
This way I can continuously monitor how much power my test circuit is drawing at a specific operating voltage. Multifunction bench power supply This power supply unit provides fixed ±5 V as well as a variable dc voltage ranging from 1.25 V to 9 V. Theory The fixed ±5 V power supplies are derived using LM7805 and LM7905 regulator ICs. Robot MarketPlace - small_geared_motors.html. Parts Assortments @ The Electronic Goldmine.
BGMicro.com - Electronics, Parts, Kits, Components, Projects, Gadgets, DIY. Kits. Electronic Components at American Science & Surplus. SmaTrig - 15-in-1 trigger for SLRs. The SmaTrig is a compact, AVR microcontroller based multi-function flash or camera trigger. Its 15 modes of operation make it come in handy in many situations. Besides the interval modes for time-lapse photography it is equipped with sensors for light and sound for capturing short-duration events or high-speed photography. It has a built-in sophisticated lightning trigger mode which reduces the shutter lag to the minimum by making use of the mirror lock-up function of the camera. The only connection with the camera is the external trigger plug.
There is no need to modify the camera in any way. The low-power circuit is powered by an integrated coin cell. Trigger modes Manual Trigger - This is the simplest mode of operation. BULB exposure - Pressing the pushbutton toggles the trigger between open and closed. Flash trigger - In this mode the camera is triggered directly by the photo-diode. The operation is explained in the following. The Circuit The one-sided board is designed with Eagle. Electronics Projects, Plans, Schematics and Source Code. 101 Spy Gadgets for Evil Geniuses.