betwixt
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Yesterday, 22:06betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsApologies for the delay - funny how nice simple meetings turn into all day torment..... I've sketched the idea I had, I'm pretty sure it is OK but...71 replies | 2209 view(s)
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Yesterday, 21:33It's a completely different principle - what look like transistors are actually two power diodes sharing a common connection on the center pin....4 replies | 148 view(s)
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Yesterday, 15:55You are looking in the wrong place. The 'Transistors' with shorts across the outside pins are dual-diodes. The outside pins are connected through...4 replies | 148 view(s)
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Yesterday, 08:13betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsHave to leave for a few hours in a moment, I'll draw a schematic for you when I get back. Basically though, think of an NE556 (or two NE555s) to...71 replies | 2209 view(s)
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14th November 2018, 22:15betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsAbsolutely no insult intended whatsoever. I just wanted to point out that there is a simpler way to achieve the same result. All it has to detect...71 replies | 2209 view(s)
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14th November 2018, 10:32You don't need to disable interrupts when reading EEPROM but you must do it while writing. When reading there is no time delay, the EEPROM contents...3 replies | 163 view(s)
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14th November 2018, 10:26betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsYou can do all that without the gates, just use a diode from each switch to combine their outputs and a single transistor to invert the result (if...71 replies | 2209 view(s)
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14th November 2018, 10:19betwixt replied to a thread What happens of DCDC module is operated outside of Vin range? in Elementary Electronic QuestionsAsk Murata for advice. Clearly they specify the voltage range for a reason, it is probably more to do with internal component voltage ratings than...6 replies | 145 view(s)
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14th November 2018, 10:15Collector to base negative feedback works when the transistor is configured in common emitter mode where base and collector signals are inverted...5 replies | 191 view(s)
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13th November 2018, 21:54If you look at all the application schematics in the TLV431 you will see a capacitor across it's anode and cathode. It contains a high gain amplifier...5 replies | 191 view(s)
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13th November 2018, 21:39betwixt replied to a thread Embed a RFID label inside a soccer ball in RF, Microwave, Antennas and OpticsThe wavelength doesn't actually make much difference to the range when they are so close anyway. What makes a big difference is the antenna size. ...7 replies | 340 view(s)
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13th November 2018, 21:32betwixt replied to a thread iR based circuit help needed in Hobby Circuits and Small Projects ProblemsThe point Barry is making is that we try to help people to solve problems themselves by tutoring them. What we specifically do not do is produce end...4 replies | 143 view(s)
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11th November 2018, 10:00betwixt replied to a thread Digital tv signal amplifier schematic in Hobby Circuits and Small Projects ProblemsEither your signal is so weak it is on the borderline of breaking up already or you are not using a good quality extension cable. Regardless of the...1 replies | 138 view(s)
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10th November 2018, 13:20betwixt replied to a thread What connects to the termianls of this Philips LED driver in Miscellaneous EngineeringSensor Ready (SR) is a two wire interface to a wireless connection, typically Zigbee but any can be used, including a full internet connection. Think...4 replies | 414 view(s)
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10th November 2018, 09:43Maybe try: https://www.intermatic.com/en/Timer-Controls/Mechanical-Time-Switches?r=60#sort=%40fsortz32xorder2802%20ascending& or...3 replies | 162 view(s)
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9th November 2018, 20:11PWM doesn't travel well through a telephone line so I would guess the pot is just to minimize distortion. I would have to see the device to be sure....4 replies | 203 view(s)
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9th November 2018, 16:18It is probably a FAX diverting device - not used much these days and not much use for anything else. They 'listen' to the line for the FAX carrier...4 replies | 203 view(s)
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9th November 2018, 15:44What is your application Vilfred? That value is quite low and if you only want to vary a voltage for measurement it will waste quite a lot of power....5 replies | 261 view(s)
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9th November 2018, 09:55There are types which are clockwork, you wind up a spring and an escape mechanism ticks as it slowly releases the tension and there are types with a...3 replies | 162 view(s)
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9th November 2018, 09:46betwixt replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsThey are not replacements unfortunately. They do basically the same job but the pin connections are different. I wouldn't consider swapping pin...21 replies | 591 view(s)
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8th November 2018, 22:52.. well, actually you can wire it with 6V at the top of the wiper as long as the voltage from the wiper is never allowed to go higher than the MCU...5 replies | 261 view(s)
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8th November 2018, 22:41betwixt replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsGot to disagree back Barry! Using the schematic in post #17 which I appreciate is not exactly as on the board, the capacitor in question is C1. If...21 replies | 591 view(s)
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8th November 2018, 22:27betwixt replied to a thread Replacing an AC Ni-Cad battery charger with a DC battery charger in Hobby Circuits and Small Projects Problems670mA is it's capability, not what it actually produces. It's the maximum you can draw before potential damage occurs but you can draw anything less...18 replies | 1068 view(s)
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8th November 2018, 12:29betwixt replied to a thread How to open PCB file in PCB Routing Schematic Layout software and SimulationPADS, Protel and several other programs use .pcb as a file extension. Most store the data as lines of text describing the start and end points of...5 replies | 219 view(s)
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7th November 2018, 23:20betwixt replied to a thread Changing a 400V capacitor in Cisco switch power adapter in Elementary Electronic QuestionsNormally capacitor(s) with that value and voltage rating are immediately after the rectifier diodes so the operation of the output circuit is...21 replies | 591 view(s)
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6th November 2018, 16:42betwixt replied to a thread VCO uses no varicaps. How does it work? in RF, Microwave, Antennas and OpticsExpect magnitudes worse! They are not particularly temperature or mechanically stable either. Note the oscillator in the schematic runs at maximum...3 replies | 157 view(s)
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6th November 2018, 10:16If Q1 is fully conducting you will get close to 0V at it's drain. R1 & R2 therefore produce a potential divider across 24V and 0V. So ~12V (really...9 replies | 261 view(s)
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6th November 2018, 10:05I suggested R28 = 330K, not 2K ! It is there to ensure leakage through the transistor and rectifiers is pulled to ground quickly when the waveform...16 replies | 447 view(s)
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