betwixt
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Yesterday, 09:54betwixt replied to a thread Simple phasing SSB modulator demodulator does not work in RF, Microwave, Antennas and OpticsAs far as I can tell, the diodes are OK but I have doubts about the input capacitor values. I think they should be the same value to avoid LF phase...5 replies | 173 view(s)
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18th November 2018, 22:29Doesn't add up... If the supply is 9V and the drain voltage is 7.9V there must be current flowing. If there was no current there would be no...32 replies | 648 view(s)
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18th November 2018, 21:38betwixt replied to a thread ESD flooring using aluminium tape stuck to the floor? in Elementary Electronic QuestionsTreez is in the UK. Believe me - low humidity is NEVER a problem here :cry: I live in the wettest part of the UK and we pray for days when it...7 replies | 226 view(s)
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18th November 2018, 21:30Lets get a few things sorted out: It SHOULD work if built properly and using the components in the schematic. Even without ANY signals being...32 replies | 648 view(s)
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18th November 2018, 11:35Sorry - should have written 'sprintf' rather than 'printf'. I wasn't aware MikroC didn't include it in the 16F library although I can understand...8 replies | 183 view(s)
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18th November 2018, 10:28'Ghost' character are usually a en electro-chemical effect where a previously displayed character is still showing AFTER it has been over written, I...8 replies | 183 view(s)
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18th November 2018, 10:18betwixt replied to a thread which is more susceptible to noise low bitrate or high bitrate in Digital Signal Processing:laugh: Having just worked on a 480 Gigabits per second link that is positively snail speed! Brian.2 replies | 156 view(s)
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18th November 2018, 10:14What use is that? The objective is to MEASURE a negative voltage, not to manipulate the figures so a positive voltage looks as though it is...4 replies | 150 view(s)
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18th November 2018, 10:06I still do not see all the components. There is a missing resistor from the JFET gate to ground and the coil is not connected properly. Is the...32 replies | 648 view(s)
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18th November 2018, 09:55betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsWell done. Suggestions, and I'm aware that you are climbing a learning curve at your own speed so please take this as constructive, not critical: ...87 replies | 2773 view(s)
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18th November 2018, 00:36Please show a picture of the top and bottom of the board and state what type of JFET and diodes you used. It should work, the meter should operate...32 replies | 648 view(s)
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18th November 2018, 00:34betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsThat looks a bit garbled but yes, the idea of double sided and indeed multi-layer boards is you can add more crossing wires without them contacting...87 replies | 2773 view(s)
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17th November 2018, 23:36betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsYou can make your own boards and there are several ways to do it. I would advise against the "toner transfer" method as it tends to give...87 replies | 2773 view(s)
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17th November 2018, 23:19Firstly - ALL the components must be fitted. If any are omitted it simply wont work. Secondly, your photo shows two diodes but there should only be...32 replies | 648 view(s)
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17th November 2018, 17:01betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsGraphically, that's wonderful but I doubt it would convert to a PCB easily. You have to consider that all the pins on the 4511 have to be connected...87 replies | 2773 view(s)
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17th November 2018, 16:14betwixt replied to a thread ESD flooring using aluminium tape stuck to the floor? in Elementary Electronic QuestionsI'm not sure that report is really accurate, 16mA is described as 'let go' AC limit but it doesn't say what would happen if you didn't let go! As a...7 replies | 226 view(s)
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17th November 2018, 11:54betwixt replied to a thread ESD flooring using aluminium tape stuck to the floor? in Elementary Electronic QuestionsChipboard (MDF or OSB) is not a good insulator, in fact it can be relatively conductive so I wouldn't have bothered. There is probably more danger of...7 replies | 226 view(s)
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17th November 2018, 10:56betwixt replied to a thread Bidirectional HF amplifier question in RF, Microwave, Antennas and OpticsThanks FvM - I didn't look at transistor specs and you are quite right about the problem it would cause. A lower than breakdown voltage might still...6 replies | 283 view(s)
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17th November 2018, 09:52Makes no difference, it still works as an input. Brian.6 replies | 262 view(s)
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17th November 2018, 09:50If you need to measure negative voltages, electrically scale the voltage range so it lies between 0V and 5V and reverse the process in software. So...4 replies | 150 view(s)
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16th November 2018, 23:51betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsI haven't ever used Express PCB myself but generally they expect a complete layout file, in other words a map of the board edges and all the copper...87 replies | 2773 view(s)
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16th November 2018, 23:13Show us your code so far and we will try to find the problem. Also tell us which compiler or assembler you are using. Brian.6 replies | 262 view(s)
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16th November 2018, 18:00betwixt replied to a thread Bidirectional HF amplifier question in RF, Microwave, Antennas and OpticsYou might get away with it if you reverse the supply on the 'off' amplifier. For example switching from +9V for ON to -9V for off but the complexity...6 replies | 283 view(s)
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16th November 2018, 17:56betwixt replied to a thread Circuits capable of compensating leakage in Analog Integrated Circuit (IC) Design, Layout and FabricationI think you need to explain what you mean by 'leakage' to get a meaningful answer. To some of us it means keeping water tanks topped up, to others...2 replies | 120 view(s)
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16th November 2018, 17:53betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsAgreed, Ground = 0V = All joined together and usually in a digital circuit, the negative side of the battery. Just a warning about 'Express PCB'...87 replies | 2773 view(s)
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15th November 2018, 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...87 replies | 2773 view(s)
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15th November 2018, 21:33It's a completely different principle - what look like transistors are actually two power diodes sharing a common connection on the center pin....5 replies | 256 view(s)
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15th November 2018, 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...5 replies | 256 view(s)
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15th November 2018, 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...87 replies | 2773 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...87 replies | 2773 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
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