Looking for interesting project for learning transistors circuits - Page 1
Forum section: electronics / beginners

author: igorbog
author_rank: Contributor
timestamp: March 24, 2012, 01:45:23 pm
content: Hi.I would like to practice with advanced transisor circuits. looking for some ineresting projects, but not power supply or audio amp. Please suggest smth interesting.

author: Blofeld
author_rank: Regular Contributor
timestamp: March 24, 2012, 06:26:12 pm
content: Some brave men have tried to build an operational amplifier, using discrete transistors. Here is an example:http://sound.westhost.com/project07.htm

author: harnon
author_rank: Regular Contributor
timestamp: March 24, 2012, 07:41:33 pm
content: Another way may be to build some logic circuits using transistors...http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html

author: igorbog
author_rank: Contributor
timestamp: March 24, 2012, 09:34:46 pm
content: Quote from: Blofeld on March 24, 2012, 06:26:12 pmI have already done it.But I am looking for advanced and interesting projects.

author: deephaven
author_rank: Frequent Contributor
timestamp: March 24, 2012, 09:49:23 pm
content: Here are my suggestions:A digital clock with all the logic done with transistors.A short wave superhet radio.A Moog style synthesiser.

author: amspire
author_rank: Super Contributor
timestamp: March 25, 2012, 01:05:04 am
content: One suggestion is something like a metal detector. There are a million different weird and wonderful designs, but they all usually involve the ability to design a good oscillator and to build a sensitive receiver.Here a a few links to start with.http://www.geotech1.com/pages/metdet/projects/rakes/rakes2_150.pdfhttp://www.easytreasure.co.uk/bfo.htmIf this is of interest to you, you can learn a few great things along the way. You can learn a lot about inductors. You can learn about designing transistor oscillators which is a very good skill to have. Just think of it. You need a 50MHz signal for some reason. If you know how to build oscillators, you grab a transistor, wind a quick coil, and pretty soon you have 50Mhz. That is something that not every electronics designer can do easily. You can also learn about biasing a transistor amplifier for lowest noise, and a heap of other stuff.Aspects of transistors like its logarithmic characteristics can be really interesting. You can make circuits that can turn input voltages and currents to a logarithmic What is this good for? It means you can build a meter that can read from 1 microvolt to 10mV or more in a single range. or from nano amps up to milliamps in a single range. It can be an interesting thing to have on the bench, and it can be particularly useful with things like measuring sound levels or light levels or if you want to start building bridges and you want high sensitivity detectors that never overload when the bridge is out of balance.See page 30 onwards ofhttp://www.ti.com/lit/an/snla140a/snla140a.pdfThe circuits need opamps (you would use a modern one, not a LM301 as in the circuits) but they are using transistors to do all the magic.Otherwise, can you give us some clues about what things do interest you? We only know a few things that do not interest you?Richard.

author: igorbog
author_rank: Contributor
timestamp: March 26, 2012, 11:34:51 pm
content: Any other ideas?

author: Andy
author_rank: Contributor
timestamp: March 27, 2012, 02:45:01 am
content: http://store.nutsvolts.com/product.php?productid=17108&cat=403

author: BlackHawk2399
author_rank: Newbie
timestamp: March 28, 2012, 09:09:07 am
content: Well you can make a 4-Bit computer and its easy too.Here is the video tutorial(kind of):https://www.youtube.com/watch?v=xISG4nGTQYE

author: MikeK
author_rank: Super Contributor
timestamp: March 29, 2012, 12:41:34 am
content: There's no lack of transistors circuits available via the googler.

author: bfritz
author_rank: Regular Contributor
timestamp: March 29, 2012, 01:45:02 am
content: I think this site does a very nice job of some fairly useful but very buildable transistor circuits:http://www.vk2zay.net/article/267There really is no end to what you can do. Also, don't forget that while you are at transistors, that you might want to look at SCR's, and FET's as well.

author: igorbog
author_rank: Contributor
timestamp: March 30, 2012, 11:19:01 am
content: Thanks... Also I thought about building signal generator. But I'm looking for sthng quality.