I am trying out four different sets of germanium diodes with my ehx soul food. Does anyone have the spice model for the 1n270 germanium diode. I would however safely bet that if you took a regular genuine klon user, removed the pedal from their board and switched out the germanium diodes out for 1n4148s, then put it back they would never notice as so few people use enough gain on the klon to get into the. A diode is described, with a photosensitive germanium region 5, which is located on a waveguide 2 of silicon or silicon germanium and in comparison with the waveguide identical or shorter by a maximum of 20 nm per side shorter lateral dimensions in has a direction transverse to a light propagation direction in the waveguide. I dont think radio shack carries any germanium diodes any more. Nov 25, 2014 i am trying out four different sets of germanium diodes with my ehx soul food. In general, we know that thepn junction diode or semiconductor diode conducts when the anode voltage is greater than the cathode voltage. However, germanium diodes have the advantage of an intrinsically low forward voltage drop, typically 0.
This is surprising, because 1n34as are the most commonly used diode when germanium is called for in a pedal. Tell us what product you were looking for and couldnt find. Germanium diode datasheet, germanium diode pdf, germanium diode data sheet, datasheet, data sheet, pdf. Also you can order online the 1n34a from radio snack for 36 cents each. Ces pedales ont vite ete rebaptisees klones, et sont aujourdhui tres nombreuses. The black glass body is twice as long as a normal do7 germanium diode and has tfk and both part numbers printed on it. I only have the free version of pspice and it does not have germanium diodes. Published on march 16, 2016 march 16, 2016 42 likes 11 comments. The diodes do nothing until the drive is cranked up. Martin chittums klon centaur schematic is shown below download a highres. Absolute maximum ratings a t t amb 25 oc parameter symbols min. These are high quality germanium diodes made by telefunken in germany. The primary difference between silicon and germanium diodes is the voltage needed for the diode to turn on or become forwardbiased. There are plenty of them on ebay until i got confuse if they are genuine or not especially when many people are complaining on other electronic forums many of those diode are.
Widely used for detecting the rectifying efficiency or for switching on a radio, tv or stereo etc. No one expected it to be what everyone is already using. The 1n34a germanium diode is an improved version of the 1n34 diode. The main thing about different diodes is the average clipping threshold of those diodes. The power losses in the diode are in this region very low compared to the rectified power.
Electro harmonix soul food, kinnatone germanium gravy mod. Germanium is created by stellar nucleosynthesis, mostly by the sprocess in asymptotic giant branch stars. We did a mod to switch between the stock ones and the correct germanium diodes but there was no difference. I add a threeway clipping toggle, with silicon soul food stock open clip the op amp for huge tone and germanium diodes centaur style on the side is a bass control to add some fatness to your pedal. Electro harmonix ehx soul food with germanium kinnatone. The differences between any two germanium diode types of the exact same clipping threshold is usually minimal. A very good components and service by electron components the products i got from electron components are best in quality it is like that it can understand our needs i cannot expect a brushless fan for rs. Semiconductors diodes germanium hard to find germanium. Testing diodes silicon, germanium, zener, shottkey. Its circuitry features boosted power rails to provide abundant headroom and increased definition. The germanium diode is used to rectify the tuned signal, the same way a signal diode would be used in an amplifying am receiver which is, in essence, the powered version of a crystal radio.
The soul food diode look like and going by ehs standard 1n4148 1n914. A semiconductor diode, the most commonly used type today, is a crystalline piece of semiconductor material with a pn junction connected to two electrical terminals. May 25, 2003 hello everyone i am trying to simulate the germainium diode characteristics in pspice. I have found several online libraries of spice models for diodes, but none of them have the 1n270. Aug 22, 2016 oa95 datasheet germanium diode, vr90v panasonic, oa95a datasheet, oa95 pdf, oa95 pinout, oa95 manual, oa95 schematic, oa95 equivalent, oa95 diode.
Nov 23, 2017 i would like to buy germanium diodes for crystal radio but i am seriously concern about the originality of the products. Best ehx soul food mod discussion in effects, pedals, strings. Electro harmonix ehx soul food with germanium kinnatone mod. Indeed, the klon centaurs diodes are germanium, whereas the soul food uses schottky silicon diodes. Ehx soul food germanium gravy mod the ehx soul food is a pretty nice sounding pedal. A diode is used to demodulate an amplitude modulated am signal. In our store, you can buy either germanium or silicon diodes, but if you do not know, what exactly you need, read the information below. The crystal diode also gives excellent linearity at low signal levels and is free from contact potential effects, input in34 cat h figure 22 poon 250 4700 n. A silicon diode forward voltage drop, by comparison, is typically 0. The 1n34a germanium diode is an old standby in electronics. Both silicon and germanium can be combined with other elements called dopants to create solidstate electronic devices, such as diodes, transistors and photoelectric cells. It is a semiconductor material, which behaves as a rectifier. It can tolerate a current density up to 100 a cm2 at a direct voltage up to 0.
Alchemy silver pony klone demo with telecaster pro junior 4. The input of the diode behaves for the rf signal like a resistor with value rd. Electroharmonix soul food overdrive pedal buyanalogman. Germanium diode is produced by fusing indium into ntype germanium. We tested them out before anyone offered mods and found the stock diodes sound the same as correct germanium diodes so we dont offer the clipping diode mod. Kinnatone premodded ehx soulfood germanium gravy mod brings this pedal to the famous klon centaur specs and beyond. Radio shack germanium diode package of 10 or 15 is the exact substitute. The sprocess is a slow neutron capture of lighter elements inside pulsating red giant stars.
It began as a ward in cheng san grc that saw the peoples action party pap scoring a slim victory over a workers party wp team led by its. These are pn junction silicon types and not point contact germanium. Productsservices for ltspice germanium diodes diodes 728 companies. The diodes that needed changing are on the flip side under the treble pot. I add a toggle switch to go between the 1n60 silicon diodes inside to your klone to nos germanium that are exact to the specs of the klon centaur. Coda effects electro harmonix soul food diodes mod step by. The soul food delivers transparent overdrive with great touch and response. If youre limited to shopping at radio shack, you could try a 1n4148 silicon diode. Check the spec sheet to ensure you understand what youre buying. In the same way that silicon diodes need more voltage than germanium, they hold a larger voltage drop. Simulating a silicon diode with a dc sweep and plotting the graph is no problem. Imo it would have been better to just replace the 1n60p diodes with the germanium ones and put silicon diodes on a switch. In my batteryless crystal radio around 1mhz the 1n581x is performing better than ge diode because of its low voltage drop.
After the germanium gravy mod this becomes so close to the klon that almost no one can hear the difference. The jhs ehx modded soul food adds a 3 way clipping toggle that gives you stock ehx slipping, open clipping and true klon style germanium clipping, not present in the standard soul food pedal. A germanium diode is a diode made using the element germanium in stead of silicon silicium. A germanium diode such as the 1n34 pictured above will typically have a forward voltage drop of just 0. Dnf delco remy dell demco dialight diode diode dynamics diode led diodes inc diodes incorporated eeekit eotvia edgewater parts eisco electrolux electronix express faginey fairchild semi frigidaire ge general electric generic herchr john deere king do way kohler manie power westech mgaxyff motorola multicomp nightfire otviap odontomed2011. Just the germanium diode hard clipping section of the circuit. Editors note, the previous two paragraphs are not to dispute jhs pedals assertion that their designs are their own, it serves only to describe my personal experience with jhs pedals prior to owning the jhs modified ehx soul food. Find list of germanium diode related suppliers, manufacturers, products and specifications on globalspec a trusted source of list of germanium diode information. However, when looking closer to the pedal, we can see that the diodes essential says bill finnegan on the pcb of the new version of the centaur, the ktr are not the same as in the klon. Rockett archer, nux horseman, wampler tumnus, and way huge conspiracy theory come to nailing the tone of a legend. A believer in bringing great tools to starving musicians, mike tasked his trusty team to create an affordable alternative, and that is how the soul food was cooked up.
The earliest diodes used germanium as the semiconductor material because a germanium junction can conduct even when the voltage falls as low as 0. For example, if you are feeding 3v into a circuit with a 1k. Maybe power of source signal is critical with voltage drop of diode and choosing between ge diode and 1n581x is critical with frequency of the signal. Reverse bias region in the reverse bias region there also exists two important areas that can be distinguished in relation to the amount. Having built a klone or two i happened to have some spare unicorn tears around 1n34a germanium diodes so i took the soul food apart for a look. Jul 23, 2015 getting a sound out of a germanium diode.
And thus the name crystal diode radio sets is used by some instead of crystal radio sets. At around the same price as the ehx soul food covered later, its a. Any given germanium make will be all over the map, too. Where to buy original germanium diodes all about circuits. Mar 03, 20 a 1n34 is a germanium diode and has a lower forward voltage drop than a silicon diode. Manufactured using germanium which has the advantage over silicon of an intrinsically low forward voltage drop typically 0. So, come to last fall when i picked up a ehx soul food. And sometimes referred to as in34a diodes or germanium detector diodes.
The jhs ehx modded soul food adds a 3 way clipping toggle that gives you stock ehx slipping, open clipping and true klon style germanium clipping, not present in the standard soul food. While both perform the same function they only let current pass through them in one direction there are some differences between the silicon and german. This could be important depending on what the diode is being used for. Germanium has been detected in some of the most distant stars and in the atmosphere of jupiter. Thus, the soul food is a cheaper version of the klon.
Electro harmonix soul food diodes mod step by step coda effects. Where the original klon had germanium diodes, the soul food makes the change to silicon, drastically changing the sonic character of the circuit. Older germanium diodes had a larger leakage of current at a reverse voltage, but now american microsemiconductor and others supply a range of improved low current leakage germanium diodes. Recifying in the square law region if the input voltage is low, lower then the voltage drop of the diode at 1 ma then the situation is completely different.
The more circuitry involved the less those differences matter. The crystal diode circuit working for each model is shown below. I add a threeway clipping toggle, with silicon soul food stock open clip the op amp for huge tone and germanium diodes centaur. Because of low drop, the headphones gets much power than ge diode.
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