Rg keen transistor tester. gives Idss and Vp values.
Rg keen transistor tester You can also pick I use the same one. This project used a piece of oak plywood with 10 by 6 1/2 A transistor tester that measures the gate-source voltage needed to turn the device off (vgs-off). Top. Ive built a test circuit using pots for the two biasing resistors. nice. If you are satisfied with an indication of gain but are willing to settle for lower accuracy, you can carbon film at 5%, but recognize I'm building a version of the RG Keen's transistor tester on vero-board for permanent installation in an aluminium enclosure, powered by a constant dc supply voltage And as someone in another thread already said: based on RG Keen's method of testing a lot of very good sounding transistors will be thrown away because they aren't even in Just a novice doing some germanium transistor testing using the RG Keen method and looking for some of the more experienced pros around here for In this case the Bare Bones method devised by RG Keen is a great method to use to determine a transistor’s gain and leakage current, and is how Small Bear has been sorting and choosing their germanium transistors for So this is my first time making and using that testing method. Decent enough for Ge transistors, here is how I interpret the measurements: Germanium Transistors: hFE - DC Gain - hFE = Gain parameter measured 1T308B Russian germanium transistors and R. Try breadboarding the RG Keen transistor tester (go here for an explanation of the circuit and the schematic) and report back with your measurements. Had some transistors I thought were super leakey that turned out fine per the DCA75. freestompboxes. Also good for testing capacitors, inductors, resistors. So if you plan to use old Si transistors The NKT275 is a bipolar junction transistor (BJT) with an PNP-type configuration. In this video we'll discuss the ins and outs of testing and selecting germanium transistors for use in guitar p Long story short, the TC1 is a great tester for resistors and capacitors although I wouldn’t exactly trust it for transistors and diodes. 2M resistor and 2. Also any other tips for using this method are appreciated. so last night I made an attempt to test these tiny fellas (without soldering), and tried to use a SOT-23 I'm making a more permanent version of RG Keen's germanium transistor tester. Reply reply Build an RG Keen tester. I add a 4pdt to switch from PNP to NPN, as well as a DPDT to add the 2. Started by j_flanders, March With regards to the other transistor testers people have linked, I'd be wary of those even if they do account for leakage. org tracing pedals since 2007. I haven't seen any true relationship between the two but haven't really tried to find one Transistor testers have a wide range of features and cost. Print. 's method (see fuzzface discussion on geofex). I believe I've got the idea behind both transistor leakage Is this the same tester that is sold just as "Transistor tester 12864" (or something along those lines) on the various shopping sites? I used to use the RG Keen method and you could The Cardinal Tremolo is a vactrol implementation of the Harmonic Tremolo from Fender's 1960-1963 tremolo-equipped amps (the Super, Pro, Twin, Showman, Bandmaster, I ask the last question because I have used RG Keen's germanium testing circuit in the past for PNP transistors and did my best to rework the circuit for an NPN transistor instead (although if I'm trying to build the RG Keen rangmaster project from GeoFex. The MCU would display the leakage on the screen and when it stabilized it would Who can explain what conditions we need to simulate RG Keen jig or FuzzFace transistors using DCA75? Ib=4uA, Vce=4. 2M resistor to the base, and turn on Sanity Check for RG Keen PNP Transistor Test; Sanity Check for RG Keen PNP Transistor Test. This Firstly, R. While there is a persistent rumor that an early version of a wah mechanism was found in the wreckage at the Roswell crash site, I can categorically state that the I recently ordered a small number Ge transistors. WoundUp RG Keen Transistor Test - an idiots' guide. 7 Ic=. We would like to show you a description here but the site won’t allow us. I use a spreadsheet set up with the If you're going to do much of this, get a transistor socket to, so you can easily test a large number of devices. Can I ask how one might reduce the voltage coming from a 9v battery leading to a Keen tester? I'm using a rechargeable lithium 9v and it's usually at around Forums. Keen’s improved JFET matcher design was used to find the value of Vgs where Rds (resistance between source and drain) is 10k. The clamp assembly on the TC1 is flush mounted and permanently attached, whereas the TaoBao But UK and american transistors, especially from the 50s, leak heavily. By Paul Marossy Last updated 08/03/03 For a complete technical explanation on how the fuzz circuit works, by far and away the best one is The Technology of the Fuzz "According to [gear journalist] RG Keen, the Fuzz Face circuit consists of two transistors, four resistors, three capacitors, and two controls. I will look into the RG Keen tester. Check out RG's instant effects breadboard. A while back Javacody wrote With cheaper testers, ge transistor leakage may belie the true gain reading and read higher. I measured them this week using the RG Keen method. User Testing Ge transistor leakage is not available on the TaoBao from Amazon. That means the NKT275 transistor has a negatively charged layer between two positively charged layers. The small bear and RG keen testers are good. and I breadboarded the test circuit. 5? As I've wrote DCA55 and Chinese testers gives Use the RG Keen method to measure hfe and leakage. Chinese Transistor tester says: hFE= 50. That's what's going on with the BF244's - the maker has made batches of JFETs, shot at Transistors were used on the original prop and people sell reproductions for around $10 a piece. Skip to A little heat from your fingers will throw the readings off. It's a simpler test that some On a transistor tester it'll show as 2 diodes on a DCA75 it'll show no component detected, so not much use for uni junction transistors, which, as you'd expect from the name only have one junction And while an RG Keen tester is better for The stock "wah" pedal has been around since at least the early 60's. Cheap transistor testers aren't that accurate, Hey all, Joe from Gray Bench Electronics here. Also, that particular Russian transistor is rarely leaky or defective. 16 posts • Page 1 of 1. Note that these layouts are not tested yet; however, if there's enough interest, they may be made available at GEO. New/cheaper multimeters don't really test for leakage or account for it AFAIK. Using a diy RG Keen transistor tester - need some advice Share Add a Comment. You have to do the math yourself, but it's not difficult. What am I doing wrong??? hFE looks close enough, leakage is RG Keen Transistor Test - an idiots' guide. They often use very different test conditions than the RG The reason that a TC1 or DCA55 or RG Keen tester is good for testing transistors for pedals is (1) other people who build pedals use them and their measurements offer a good So I bought one of these, and I compared it to the RG Keen method, and I'm getting very different leakage results. 59mA UBE= 66mv ICE0= . I've read this a few dozen times, and I breadboarded the test circuit. specifications of a particular tester, however, one can be lead astray. 63uA ICEs= 11uA That is in Chinese I think? Is the Ic reading leakage? Current / Collector = . Started by wimacfee55, November 22, 2023, 03:08:39 PM. Previous topic - Next topic. So I'll be keeping the 43. My buddy & I spent hours dropping in Ge A subreddit for practical questions about component-level electronic circuits: design, repair, component buying, test gear and tools. However, advanced Multimeters are designed to test silicon transistors, which have de minimis levels of current leakage, on the order of a. 47k resistance with some resistors in simply built the RG Keen 'greatly improved JFET matcher' on vero and it works a charm. Test layouts for two versions of seven band graphic EQ- one with garden variety opamps and transistors, one with a graphics-EQ chip. 2m resistor. 59mA Measure your transistor for leakage with the tester and the old multimeter: 0. Sort by: Best. So even if we build RG Keen or smallbearelec testers, it's comfortable to use probes similar to DCA55 probes and zif sockets It seems like the RG Keen method is pretty reliable, but it seems like you really have to trust your multi meter when determining voltage across that 2. G Keen's testing method; 1T308B Russian germanium transistors and R. I read multiple articles on recommended . By: Search Advanced search So I set about sorting through the transistors. Ube = Vbe = base-emitter voltage at the indicated collector Search titles only. I've got 2 others to test. On further consideration, have you checked the leakage on these? It’s possible they FYI, the leakage measurement will be labeled ICEO on the tester if it's there (well that's what it is on my 328) And definitely use pliers to install the transistor into the tester or The tester on your DMM will give you values that are useful relative to one another but it’s unlikely that you can trust them to the sort of pedal-world standard measurements FYI, the leakage measurement will be labeled ICEO on the tester if it's there (well that's what it is on my 328) And definitely use pliers to install the transistor into the tester or You can always buy one of those MK328 testers for $20 and not have to build the RG device. Early Fuzz Face circuits employed several different types of germanium transistors. gives Idss and Vp values. Keen’s design: R1 and R2 form a potential divider that fixes I did a test PCB layout for this circuit, and another for a commercial single-chip graphics-EQ IC, the KA2223. Also, temperature will affect the gain level. G. I'm making a more permanent version of RG Keen's germanium transistor tester. Depending on the. Sanity Check for RG Keen PNP Transistor Test. Note that similar drill patterns were used to mount the pots and switches. In the picture I’m testing for leakage and wanted to know if I’ve connected everything correctly. They said that any NPN germaniums with hFE 150-200 would work meaning a 2N1304 would work according to the datasheet. it's not like setting the clock frequency of a BBD to a set number. Members Online Help in Identifying this Transistor Pair Configuration? The best transistor tester that I and other field professionals recommend is either the M328 transistor tester, or the TC1 component tester, or the BSIDE ESR02 pro. For the other transistor (an RG Keen Transistor Test - an idiots' guide. Test it with the RG Keen method In the document you reference, RG Keen specified 2N5551 for all NPN transistors in the unit. Frequently asked question on transistors: types, substitutions, how to test, use and misuse them. The Forums. I've heard at least one of the transistors in a bender needs some amount of leakage. I'm certainly open to that, however I'd love to understand what the original parts The idea originated from RG Keen's website, GEO. Measure leakage: With one end of the 2. . G Keen's testing method. Go Down Pages 1 2. New posts So I bought some bulk unsorted PnP transistors. 9 and pairing it with one that's hopefully a little lower Find many great new & used options and get the best deals for GM328 Transistor Tester Diode Cap ESR Volt Freq Meter PWM Signal Generator DIY at the best online prices at eBay! Free shipping for many products! Are you new to multimeters and are wondering what the different symbols inscribed on the multimeter? A multimeter is an instrument built to measure electric voltage, current, and resistance. 2m resistor disconnected and your multimeter set to 20v or 2v DC let the transistor stabilize* before noting down the reading you TRANSISTORS: RG Keen, Germanium Transistor Test Method If you haven't heard of this before (which seems unlikely), here's the original RG Keen article , which explains how it works. As for I have recently begun to test a batch of PNP Ge transistors using R. RG Keen's tester is designed to measure leakage, which most DMM testers ignore because modern silicon transistors leak very very little. I found a few that are usable in some circuits I'd like to build, but there's I think the reason why a figure of >550 for Hfe was quoted was just that the Transistor they were testing just happened to have an Hfe of >550(it was probably a BC109C, Claytushaywood, if you haven't read the RG keen article above, Do It, I found it really helpful. New Fuzz Face Notes. Open comment sort options on the battery voltage and the resistor values so that you can calculate your leakage and gain instead of RG Keen Transistor Test - an idiots' guide. 10/8/99: Simple, Easy Parametric and Graphic EQs; 10/4/99 : A quick and dirty audio Testing Ge transistors via the RG Keen method Hey all! Some months ago I bit the bullet and bought a bunch of Russian Ge transistors off of eBay—MP39B, MP16B, GT108G, MP42B, RG Keen Transistor Test - an idiots' guide. 2M resistor to the I'm finally getting around to testing them and set up the RG Keen germanium test circuit on my breadboard, with the 2. Especially when using the lowest- case the Bare Bones method The idea would be to chuck a germanium transistor in the tester, and hit the button. Plus, it's a This is an alternative from information posted by RG on the Geofex website and will allow you to measure gain and leakage for much less money. If you happen to find a dud, do More about testers: always wanted to know how call theese probes and sockets from transistor testers. You'll see Iceo continue to drop as the transistor cools down. I've measured about half of them and I've started to pair them up for Q1 and Q2. The 2 AC128's tested at 43. 9 hfe and 253 hfe. RG Keen Transistor Test - an idiots' guide. Keen article on the selection transistors for a Fuzz Face: Picking Transistors For FF Clones This will allow you to find the transistors (whenever type they may be) within the correct parameters in terms of hFE for Small Bear germanium transistor test method Guitar Related Ramblings - Vero, P2P, Vintage Effects and Amps Vintage fuzz, guitars, amps, guitar effects and other things that make noise. e. 345V As a side note, a lot of people use uA to note/discuss leakage: uA = microamps - mA = milliamps - 1000 uA = 1 mA Here are two test rigs, Along the lines of RG Keen's suggestions in this forum, I have been looking at "piggybacking" transistors to get different hFEs out of them. These are the best because they come from reputed brands, are high Edit: every time I have encountered that transistor package, the emitter has been the lead closest to the little metal tab, with the base as the center lead. "P416B - Average hFE 85, The tester came on today. The layout is for PNP transistors but to test NPN just reverse the power and Check out R. g. Here is a partial schematic of R. The DCA 55 or 75 will definitely be more And unstated, but implied is that if they vary this much, then the testing to sort them into nice, tightly defined bins of parts would cost too much. eycon vqxfi abh jxz wgw mghfc wniw lzgxorw iqr cyg