Comments on: Altoids pocket amplifier

By: jeans

jeans — Mon, 09 Aug 2010 06:42:26 +0000

This can be done by using a rectifier

By: mp3 dinle

mp3 dinle — Fri, 06 Aug 2010 16:31:13 +0000

admin thank you

By: evden eve nakliyat

evden eve nakliyat — Wed, 03 Mar 2010 13:38:21 +0000

thank you.

By: martha

martha — Tue, 06 Mar 2007 21:54:12 +0000

Does anyone have suggestion for tiny speakers to hook up to the altoids amp? Thanks, m

By: amplifier of car

amplifier of car — Wed, 10 Jan 2007 16:55:48 +0000

Hello I am eric

By: DIY Live » DIY Archive » Ten most needed circuits for the DIYer

DIY Live » DIY Archive » Ten most needed circuits for the DIYer — Mon, 19 Dec 2005 17:35:57 +0000

[...] 10. The 5 v voltage regulator is a must, and is used to convert any 9v battery to the much needed 5 volts. This is used to power IC (integrated circuit) chips, as well as can be connected to a USB port to charge your ipod. The most common part is the 7805 chip, and here is the schematic. 9. Most projects require the use of an LED. This stands for a light emitting diode, and a diode only lets current go in one direction. It is important to put the LED into the circuit correctly or it won’t work. The longer lead is the positive lead, and must be placed in the circuit that way. theledlight.com gives an indepth tutorial on how to find the correct resistance values for different LEDs. Just remember the old equation V=IR (Voltage = Current * Resistance). For a nine volt battery a good 470 ohm resistor is a safe bet. Here is the simple circuit. 8. There are many times when a transistor is needed to be used as a switch. The NPN transistor can be used when the base is brought to a high voltage. The input current needs to be lower than the current through the collector (the top pin of the transistor). There is a 0.6 v drop accross the transistor, so the voltage accross the RB is going to be input voltage-0.6v. Go here for a more thorough explanation of picking the right resistor values. 7. There are many projects that require the use of USB, so it is important to know what the different pins of the USB are. 6. There is much need for a simple audio amplifier. There are many ways to do this, one is to use a darlington transistor like my 1-watt amplifier, and another way is to use an opamp like my post on the CMOY pocket amplifier, but the best way is to use an LM386 chip. The different gains can be changed by changing the resistor values. C5 filters out the DC, and C4 and R1 act as a low pass filter. Go to warplink.com for the values to use for the comonents. 5. Often times when dealing with amplifiers you will need a low pass filter. This can be done with a simple RC circuit. To find the frequency that you are filtering, use the formula F=1/(2*pi*R*C) 4. If building a robot that follows a line, it is important to have an Infrared sensor and detector. You can read about this in my line following robot post. 3. Often it is necessary to use a simple NPN transistor as an amplifier. This is useful as a preamp for a microphone, or even as a motor controller. 2. It is important to test your circuits before soldering anything together. Lots of times it is useful to have a powersupply that you can plug into the wall. Here is a circuit for building a 12v power supply. , this could be changed to a 5 volt power supply alsoThis is from a recent post of mine found at 12v power supply 1. It is often important to convert an AC signal to a simple DC signal. This can be done by using a rectifier. This can be found from a previous post of mine at AC-DC rectifier The diodes make the negative part of the AC sin wave positive, and the capacitor smooths out the ripples. [...]

By: DIY Live » DIY Archive » Ten uses for the Altoids tin with an Ipod

DIY Live » DIY Archive » Ten uses for the Altoids tin with an Ipod — Sun, 04 Dec 2005 16:13:04 +0000

[...] 1. You can build amplified speakers for the Ipod (I will be doing this soon) 2. You can store all of your accessories in it. (Which includes saving all of your money in it so you can afford an ipod) 3. Carry headphones and shuffle in altoids case 4. Altoids carrying case for Ipod Nano 5. You can put your headphones in the altoids can, and make a portable altoids stereo system. 6. You can put a battery in the altoids can, and connect it to your ipod via USB via a 5V regulator. 7. You can put a 9 volt battery in series with 2 1.5 volt batteries and make 12 volts via firewire. 8. You can build a CMOY pocket amplifier for a headphones (Like the one that I have previously written about) 9. You can cut a rectangular hole in the top of the can, and slide your new ipod into the hole. You have made a docking bay. 10. you can cut the altoids can into tiny strips, and wrap it around the antenna of your new griffins radio transmitter and up the ouput signal. (This has not actually been done, but it would work in theory) My friend over at Zerosign.net wrote about hacking the Griffin itrip. [...]

By: DIY Live » DIY Archive » The REAL top ten list

DIY Live » DIY Archive » The REAL top ten list — Sun, 04 Dec 2005 02:35:06 +0000