treez
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22nd October 2019, 20:12Thanks, this is why i was asking about the conductivity of the water, and the conductivity of the earth soil, because according to the videos, and...3 replies | 262 view(s) -
22nd October 2019, 06:08treez started a thread How much does a solder stencil cost for a 160mm * 60mm PCB? in PCB Routing Schematic Layout software and Simulation...With SMD components on top and bottom. (approx)1 replies | 125 view(s)
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21st October 2019, 19:16treez replied to a thread Vias covered in solder resist get outgassing problems? in PCB Routing Schematic Layout software and SimulationAgain today, we got criticised by our board manufacturer for having 0.3mm vias with their restrings covered over in solder resist. They told us they...1 replies | 418 view(s)
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21st October 2019, 19:13treez started a thread Pre-defined layer colors in GC Prevue? in PCB Routing Schematic Layout software and SimulationHi, Every time we re-do the gerber files for a PCB, (which is very often) we have to reload it into GC Prevue to view the gerbers. How can one...0 replies | 98 view(s)
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21st October 2019, 18:44Hi, In this video, a Chinese shower is examined which is literally no more than a bare conductor across the live mains with water flowing over it,...3 replies | 262 view(s)
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20th October 2019, 12:14Presumably also, if its an input stage to an isolated SMPS, and the oputput of the SMPS is earthed, then that also bypasses the input filter common...4 replies | 357 view(s)
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20th October 2019, 12:04Yes, your transformer appears to be an planar transformer, and appears to have leakage inductance designed into it deliberately so its an...7 replies | 404 view(s)
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20th October 2019, 11:45Thanks, I previously thought that "Modulator gain" = And that the complete open loop comprises the "modulator", the "power stage", and the...18 replies | 1110 view(s)
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18th October 2019, 22:31I believe that the power stage transfer function can be greater than 0dB for the case of voltage mode (not current mode) , and when at the resonant...18 replies | 1110 view(s)
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17th October 2019, 20:38Theres also a two switch buckboost, which also has two diodes, which can serve if vout > or < vin. I wont draw it, i am sure you can get it. It...21 replies | 893 view(s)
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17th October 2019, 18:41Try the LT8705...this is a "bock or boost" converter........it acts as a buck if vin>vout, and acts as a boost of vout > vin LT8705...21 replies | 893 view(s)
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17th October 2019, 15:39I replaced the shorted LLC converter FETs in the 400V PSU...and the IR21531S, but when i re-assembled and switched on it went bang again and wouldnt...1 replies | 250 view(s)
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17th October 2019, 08:27treez started a thread Vias covered in solder resist get outgassing problems? in PCB Routing Schematic Layout software and SimulationHi We have a load of 0.3mm vias on our 4 layer PCB. Surely it will be OK if I coat them in solder resist? We wont get “outgassing”? (Outgassing is...1 replies | 418 view(s)
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16th October 2019, 18:43if its a lithium battery then it may well have a circuit in it which stops you from being able to discharge it further down than 3v. If not then ...5 replies | 334 view(s)
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16th October 2019, 18:37In Buck-Boost you will tend to get more switching losses as your fet off state voltage will gernerally be higher. Also, the rms fet current will be...21 replies | 893 view(s)
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16th October 2019, 06:15treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power Electronics5 and 6 are primary bias. I am not sure if their were scorch marks, they just told us we failed. If it goes over 3mA when 3.5kv is applied for one...13 replies | 735 view(s)
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15th October 2019, 20:51Hello, Does anyone have a schematic for this HSPY-400-01 Bench power supply? (400V, 1A) ...1 replies | 250 view(s)
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15th October 2019, 19:13treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsThanks, the pinout is as attached. There was tubing used yes. As you know, There is easily 8mm betweeen primary pins and secondary pins. ...13 replies | 735 view(s)
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13th October 2019, 20:55treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsThanks, its re-inforced insulation.13 replies | 735 view(s)
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13th October 2019, 18:33treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsYes, and as discussed, its primary, bias and secondary with TIW. The primary bias coil is the last to be wound on it, (so its the top layer) ...13 replies | 735 view(s)
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13th October 2019, 18:03treez replied to a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsTEX-ELZ Triple insulated wire by Furukawa is surely rated to 3.5kv for one minute? https://www.furukawa.co.jp/tex-e/en/product/texe_feature.html...13 replies | 735 view(s)
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13th October 2019, 13:40treez started a thread Which transformers can pass approvals testing rergarding isolation voltage testing? in Power ElectronicsHello, Our contractor designed a 10W, 24Vout, offline Flyback SMPS for 240VAC input. He had a split primary and a bias coil on the primary side,...13 replies | 735 view(s)
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12th October 2019, 14:40treez started a thread Protecting the inputs of HV7802 current monitor from damage due to inrush current in Analog Circuit DesignPage 4 of the HV7802 datasheet (RHS of page, 2nd paragraph down), states that adding a resistor into the LOAD pin gives protection for the HV7802. ...4 replies | 336 view(s)
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11th October 2019, 06:14treez replied to a thread Film capacitor failed in flyback smps at high temperature? in Power ElectronicsThanks, i wonder how high the temp has to be, and for how long, with the cap of the top post to get this failure? Its datasheet doesnt tell of this.5 replies | 522 view(s)
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9th October 2019, 08:01treez started a thread Film capacitor failed in flyback smps at high temperature? in Power ElectronicsHello, We are using the ECW-FD2J185 (1.8uf, 630v) film capacitor in our offline flyback smps, 240vac input. It is for 24v, 10w output. We sent...5 replies | 522 view(s)
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7th October 2019, 06:39treez replied to a thread Input stage to 24W buckboost LED driver is high in component count. in Power ElectronicsThanks, yes if we cant find low enough rdson fets (which we probably wont at the high vds) then we will use a standard diode.....3 replies | 313 view(s)
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6th October 2019, 19:00treez started a thread Input stage to 24W buckboost LED driver is high in component count. in Power ElectronicsHi , The attached is an LTspice sim and pdf schem of the input stage to a 8-136vdc input , 24w buckboost led driver. The Vin may also go up to...3 replies | 313 view(s)
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6th October 2019, 18:11Thanks asdf44, your RHS example above is absolutely great. It looks so good that id like to simulate it to see it going.,...but ltspice doent do dep...13 replies | 883 view(s)
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6th October 2019, 12:31treez started a thread Reverse polarity protection with FET is somewhat blighted by CDG capacitance in Analog Circuit DesignHi, It is necessary to provide reverse polarity protection for a 24W Buckboost LED driver with Vin = 8 to 136VDC. (when vin <18v, then power can be...1 replies | 179 view(s)
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5th October 2019, 20:58treez started a thread Why should a solder joint be less than 110degc? in Elementary Electronic Questionshttps://www.vishay.com/docs/28870/pulseloadsmdlimit.pdf Page 1 of the above says a solder joint should not be 110deg C or more..why? I looked on...3 replies | 322 view(s)
About treez
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- Date of Birth
- April 5, 1982 (37)
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- cyclist
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- cambridge
- Interests:
- football, cycling
- Occupation:
- engineer
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