2sc1969 vs irf520 mosfet finals Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio. Aug 29, 2010 · I've done dozens of Cobra 29's over the years, and was always partial to 2SC1969 finals. (Idee by weazle66) If you properly replace the 2SC2166 driver and 2SC1969 finals in SSB chassis with three IRF520 mosfets, you will gain slightly more power when done correctly. If your radio still has a working bi-polar final in it, keep it in there. i know other people are Dec 18, 2008 · 2SC2312= final. The output impedance seen by the FET is roughly V*V/2P where V is DC supply voltage and P = power out. Dec 17, 2009 · All the info I am finding on this is for replacing 2SC1969 transistors with ERF2030 mosfets, My radio came stock with the single IRF520 mosfet, would like info (details) on converting this specific setup to dual mosfet finals if it has been done and what I might expect to see out of the radio for the trouble. And the dual final conversion is a waste of money for results when I would get more from an amp. 2SC1307=final. However, recently it has come to my attention that Fairchild makes a MOSFET called the FQP13N10 (as used in the Stryker SR-955HPC for example) that is a Oct 5, 2008 · He said it would put out more power. Might be time to have it checked by a competant tech. #cbradio #electronicscreators #ukcbhttps://bmc. I routinely saw a single 2SC1969 do as much or more then two 2SC2312's or 2166's in various dual final exports compared to sigal final FCC type approved SSB radio's May 27, 2013 · The worst ones are the coupling caps between the finals and the output network, generally 500pf to 1000pf. Sep 16, 2010 · SO , now I have to ask is WHY would anyone try to go with the 2SC1969 build. Jun 17, 2008 · The FQP is NOT bullet proof. Am I missing something by using the Mosfet build? I cannot see any reason why every CB radio does not have a conversion using these parts vs having to hunt for a non china made 2SC1969 The Cobra 29 is the ford truck of radios. Thanks for the info. Many are using IRF520 despite it's high input capacitance Ciss 360pF. com/groups/357411463021624Join 2SC1969/2SC2312 → IRF520 → FQP13N10 "Novos transistores" Ao interromper a fabricação dos transistores 2SC1969 e 2SC2312 que equipavam a saída de potência da maioria dos rádios da banda do cidadão nos anos 80/90, o transistor IRF520 chegou e ganhou espaço. Feb 21, 2016 · In the Galaxy DX2547, they replaced the 2SC1969 Final Transmitter Amp, and its Driver, 2SC2166C, with MOSFETS IRF520. The radio appear work fine but no power Tx Radio Make and Model: President Jackson Mar 16, 2009 · Black Spirit wrote:The manual has the transistor as MOS RM3 [Mosfet] so i should imagine an IRF520 [IRF520N], FQP13N10 should work or even an 2SC1969 There are alot of fakes out there though. Sometimes the ones on top of the cores are the culprit. They used the name "ECG Philips" and continued to sell the ECG parts. they are a great final, very robust, and will usually put out a watt or two more than a 1969. Apr 18, 2008 · Install IRF520 at TR43 Install EN-369FN companion part across final, positive side to gate, unmarked side to source Install 56k ohm resistor from IRF520 gate to L31 (goes to far side of L31, furthest away from final, +13V) Install 39pf capacitor across C167 (This is optional, will bump up output in some units, test radio without first) Oct 18, 2017 · I have this radio and that was broken, the final transistor blow and i replace the original MRF477 for 2SC1969 but now don't have Tx anyway. would the RFX75 Powerband driver be If you properly replace the 2SC2166 driver and 2SC1969 finals in SSB chassis with three IRF520 mosfets, you will gain slightly more power when done correctly. We have had good luck with the HG1969, but it's not as tough as the original Mitsubishi. The radio will also have less than 10% distortion at full-modulated power. Remove C53 and solder it across C59. If P = 10 and V=12 then the output impedance is about 12*12/2*10 = 7. Example was 2SC1969. I've never bought the eleflow transistors off him,but have bought original nec 2sc1307 and mitsubishi 2sc1969 and international rectifier irf520 from him,he's always been a very genuine guy to deal with. i was wondering if anyone could help with info to convert it to an irf520. no cut and snip in this shop. discontinued the lineup about 2004. Pushing the mosfets harder will naturally give higher wattage but this comes with problems like harmonics, Mar 28, 2016 · Reason why they mostly eventually fail is because FM mode the driver and finals are direct to 13. The problem is Rds - the on Resistance, which is 0. I know people either love em or hate em. This was several years ago when this happened which is why all new Exports now have mosfets. Mar 13, 2021 · The RD06HHF1 was the perfect MOSFET replacement for the driver stages and the RD16HHF1 would have been great either as a single, or dual final. The gain in output isn't worth the hassle. Keeping the input circuit of an amplifier close to 50 ohms is your only hope using either of those parts. each transistor has a bias adjustment pot. can be substituted for the 2SC1969, and the 2SC2312. Good luck. Besides the "negative" of the labor involved in the swapout, is there anything to be gained by the swap? Will the 'fets give more watts out. it has two trannys mounted to the rear heatsink, one was a 1969 and. Years passed, Sylvania sold their ECG division to North American Philips. eBay and scalpers sell some, but mostly fakes or silly expensive. When I install mosfets, its because the customer wanted a low cost alternative to a bi-polar. . A worn-out relay is a common radi Jan 14, 2008 · The 510 is a 5~15 watt fet. Pushing the mosfets harder will naturally give higher wattage but this comes with problems Jan 6, 2014 · Here's a good link for reference when designing with mosfets to operate in the linear region. The IRF510 is half that, at 180pF. Jan 24, 2009 · Yes, the old rugged 2sc1969 is no longer being made as well as the 2312. Why? Why would that be an improvement, technically? Thanks for sharing your knowledge. The MOSFET is Voltage in, current out device given by equation 1 in app note. If you properly replace the 2SC2166 driver and 2SC1969 final with the IRF520 mosfets, you will gain slightly more power when done correctly. Bear in in mind a bipolar transistor is a current in, current out device. well i don't remember what the other was, so i'm not sure if it has dual or single finals. 4 ohms for the IRF510. Jan 15, 2014 · I have a RCI-2950DX with transistor driver and finals (2SC1969's). May be marginally tougher than the IRF520, but I'm not sure how you'd measure that in a convincing way. facebook. I also have 3 mosfet IRF520's on hand that I could swap in place of the transistors. However, I recently got the opportunity to work on the following FACTORY MOSFET'ed Galaxy transceivers: - Galaxy DX-98VHP which has three (3) IRF-520's (1 as a driver and twin finals) driving an Feb 16, 2013 · MOSFET Supertune (29LTD classic and newer): Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing). Never forget that a base station's power supply may not have the additional oomph to support a MOSFET mod. 8v so you have full output [usually around 12 - 15w] Some people might think this is great but it isnt, The amount of Cybernets mostly 121/125 boards i have seen where the coil [the tall brown one behind the 1969] the enamel on the copper coil has cooked and fused together so output drops to almost Mar 15, 2009 · Unlike the guys using light bulbs and dosey meter's in shacks and truck stops with names like "Wizard" we used scopes, signal generators, etc. twin IRF520's. can be substituted for the 2SC1969 and the 2SC1307. While the RD16HHF1 is conservatively rated at 16 watts output and the 2SC2312 was 17 watts, take a look at the dissipation ratings for these parts in their datasheets. these are not made anymore, and most of the ones you find online are fakes. We have had decent results from the HG 2SC1969. Aug 29, 2010 · In single final radios, I typically see the MOST gain with the IRF520 versus the 2SC1969. 25. link/microchipzytJoin the official channel Facebook group https://www. It makes a better driver than final though. Remove them and check them, If they are bad, I replace them with a good quality silver mica. Nov 10, 2008 · my euro3900 had a 2sc1969 final that went poop. Dec 15, 2008 · The IRF520 being what it is, really don't need a ton of power to drive them - remember the 3900 is a SSB type of radio so the single drive to dual final conversion was a drop in and they used "Zener" to limit the drive voltage and provide a small window of linear operation. Oct 12, 2009 · Question on the Dual final mod for the Galaxy DX2547 with IRF520 mosfet All the info I am finding on this is for replacing 2SC1969 transistors with ERF2030 mosfets, My radio came stock with the single IRF520 mosfet, would like info (details) on converting this specific setup to dual mosfet Small instruction abt. Matching Mosfets are a good idea but not as critical as with bipolar transistors. Pushing the mosfets harder will naturally give higher wattage but this comes with problems Dec 28, 2011 · But overall, they aren't worth it, since there still are bi-polar transistors available. In dual final radios, it's a 50/50 split between a beta matched pair of 1969's, vs. 2 Ohms. The "236" is the sideband final transistor from that product line. Feb 17, 2016 · An old ECG catalog lists type "ECG235" as the AM final/SSB driver equivalent to a 2SC1306 or 2SC2166, 2SC2078 and many others. Changing over to a mosfet is NOT worth it. Apr 3, 2005 · The IRF 520 famously does not tolerate high SWR. A pair of 1969's right now would probably run 25+ dollars, two irf520's probably $1. replacement for 2SC1969 final stage transistor , with IRF520N MOSFET, on CYBERNET's PTBM121D4X CB-Radio Board. I haven't. This was 10 years back and the MOSFET conversion was the big new thing. Is That correct that the MOSFET conversion done correctly will increase output, or was he just doing work to increase his bill. Nov 10, 2017 · Working on an vintage CB radio and find NPN bipolar finals are long obsolete, Mitsubishi/Sanyo etc. i have no reason to doubt his eleflow replacements will do as he says. The manner in which they are used as finals in an HF radio is open loop. Sep 17, 2010 · The company manufacturing the 2sc1969 etc replacements is Eleflow,the uk seller is Mark,weazle66. coxgfr ztovi impdkxvk bvncqc ywpk uskv bsxura emzul clxq ljeycwnl discnx jbdys gocf bqfl kyg