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7805 TURN ON I've built a circuit that's powered from a 7805 regulator. When a high is presented to the base of Q1, the resulting low at its collector pulls enough current through R1 to turn on Q2. Only when an external signal is connected does the genlock de- pend on that signal's synch pulses to synchronize the computer to the external video source. I'm looking for some way to turn the regulator on and off using external logic from another device. The 78XX family of regulators are convenient ways to control circuit voltage but, being three-terminal devices, there's no handy dandy pin available to turn them on and off. Using two transistors is a good idea since Q1 not only does the needed inversion to properly control Q2, but it acts as a buffer to help isolate the controlling logic circuit from the power supply. In that mode, the quality of the output signal is limited to the quality of the input signal. 9" Monitor — Item #22481 IRFEt .95 3V2" FLOPPY DISK DRIVES Half Height Capacitance: i. I've got buffered outputs available, but I'm not sure exactly how to go about it. Fortunately, controlling one of them with external logic only in- volves the addition of a few parts to the board. The only thing critical in the cir- cuit is the value of R1, because it has to pass enough current to turn on Q2. With a Panasonic AG1950 VCR as the source, the out- put of the Supergen will meet NTSC specifications. Since it's in the circuit as a current limiter, it's not too difficult to calculate the needed value. With no external signal con- nected to the genlock (i.e., "source VCR not operating"), the Supergen works fine as an en- coder. 8*4995 9,95 JAMECO IBM PC/XT/ AT COMPATIBLE CARDS JE1 050 Monochrome Grapnicfi Card w.'Paraliel Printer Pert {PC/XT/AT) .95 JE1052 Color Card w JParallel Printer Port (PC/XT/ATI - .95 JE1056 EGA Car O W*25SK Vrdeo fl AM (PC«T«T) 9-95 JE1071 Multi VO Card w/Conlrorjar £ Monochrome Graphics (PCIXT)

7805 TURN ON I've built a circuit that's powered from a 7805 regulator. When a high is presented to the base of Q1, the resulting low at its collector pulls enough current through R1 to turn on Q2. Only when an external signal is connected does the genlock de- pend on that signal's synch pulses to synchronize the computer to the external video source. I'm looking for some way to turn the regulator on and off using external logic from another device. The 78XX family of regulators are convenient ways to control circuit voltage but, being three-terminal devices, there's no handy dandy pin available to turn them on and off. Using two transistors is a good idea since Q1 not only does the needed inversion to properly control Q2, but it acts as a buffer to help isolate the controlling logic circuit from the power supply. In that mode, the quality of the output signal is limited to the quality of the input signal. 9" Monitor — Item #22481 IRFEt $29.95 3V2" FLOPPY DISK DRIVES Half Height Capacitance: i. I've got buffered outputs available, but I'm not sure exactly how to go about it. Fortunately, controlling one of them with external logic only in- volves the addition of a few parts to the board. The only thing critical in the cir- cuit is the value of R1, because it has to pass enough current to turn on Q2. With a Panasonic AG1950 VCR as the source, the out- put of the Supergen will meet NTSC specifications. Since it's in the circuit as a current limiter, it's not too difficult to calculate the needed value. With no external signal con- nected to the genlock (i.e., "source VCR not operating"), the Supergen works fine as an en- coder. 8*4995 $599,95 JAMECO IBM PC/XT/ AT COMPATIBLE CARDS JE1 050 Monochrome Grapnicfi Card w.'Paraliel Printer Pert {PC/XT/AT) $59.95 JE1052 Color Card w JParallel Printer Port (PC/XT/ATI - $49.95 JE1056 EGA Car O W*25SK Vrdeo fl AM (PC«T«T) $159-95 JE1071 Multi VO Card w/Conlrorjar £ Monochrome Graphics (PCIXT) $1 1 9.95 JE1060 I/O Card w/Senal, Game. $59.95 JE10S1 RS232 Serial Half Card (PCOST) $29.95 JE1062 RS232 Serial Hall Card (ATI $34.95 J E1 065 I/O Card wr Serral , Game and Parallel Printer Port [ATI.,,,., .... Ideal lor work with electrical wiring 1 electronic drcuitry. New - $19.95 High Intensity replacement bulbs avail. Just try to catch a100-ns glitch with cal- culus and figure where it came from! 3 shows pin 7 of 1C3 (the 555 astable) connected to R13 or R14 via switch S3-b, with both potentiometers grounded. The 4-page "Vid- eo Formats and Required Load Terminations," the 2- page "Improved PCB Layouts for Video RAD- DAC's Can Use Either PLCC or DIP Package Types," and the 1-page "Changing Vour VGA Design from a 171/176 to an ADV471" all include waveforms, diagrams, and tables relating to the use. CIRCLE 19 ON FREE INFORMATION CARD The monolithic devices can be used in compliance with various international standards that specify video levels used in television and video monitors. Figure 1 in the sidebar on page 40 shows pin 7 connected to the collector of an internal NPN transistor. The first note describes and com- pares some of the more common standards and de- tails the required load ter- minations for the video RAM-DAC's. Discover, Explore, Experience for Yourself— 15-Day Trial. As you add additional boards, you create increasingly complex circuits easily and quickly, bringing today's electronics concepts to life. M Y //7SS RADALERT TAKES OFF You made a real contribution when you published the "Radalert" articles in the June and July 1988 issues of Radio-Elec- tronics.In all ways, the Contem- porary Electronics Series is an exciting learning experience that offers you the quickest and least expen- sive method available to master today's electronics. To order your first module for a 15-day trial examination, simply complete the card and send today! I was glad to see a follow- up article in the June, 1989 issue.

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7805 TURN ON I've built a circuit that's powered from a 7805 regulator. When a high is presented to the base of Q1, the resulting low at its collector pulls enough current through R1 to turn on Q2. Only when an external signal is connected does the genlock de- pend on that signal's synch pulses to synchronize the computer to the external video source.

I'm looking for some way to turn the regulator on and off using external logic from another device. The 78XX family of regulators are convenient ways to control circuit voltage but, being three-terminal devices, there's no handy dandy pin available to turn them on and off. Using two transistors is a good idea since Q1 not only does the needed inversion to properly control Q2, but it acts as a buffer to help isolate the controlling logic circuit from the power supply. In that mode, the quality of the output signal is limited to the quality of the input signal. 9" Monitor — Item #22481 IRFEt $29.95 3V2" FLOPPY DISK DRIVES Half Height Capacitance: i.

I've got buffered outputs available, but I'm not sure exactly how to go about it. Fortunately, controlling one of them with external logic only in- volves the addition of a few parts to the board. The only thing critical in the cir- cuit is the value of R1, because it has to pass enough current to turn on Q2. With a Panasonic AG1950 VCR as the source, the out- put of the Supergen will meet NTSC specifications.

Since it's in the circuit as a current limiter, it's not too difficult to calculate the needed value. With no external signal con- nected to the genlock (i.e., "source VCR not operating"), the Supergen works fine as an en- coder. 8*4995 $599,95 JAMECO IBM PC/XT/ AT COMPATIBLE CARDS JE1 050 Monochrome Grapnicfi Card w.'Paraliel Printer Pert {PC/XT/AT) $59.95 JE1052 Color Card w JParallel Printer Port (PC/XT/ATI - $49.95 JE1056 EGA Car O W*25SK Vrdeo fl AM (PC«T«T) $159-95 JE1071 Multi VO Card w/Conlrorjar £ Monochrome Graphics (PCIXT) $1 1 9.95 JE1060 I/O Card w/Senal, Game. $59.95 JE10S1 RS232 Serial Half Card (PCOST) $29.95 JE1062 RS232 Serial Hall Card (ATI $34.95 J E1 065 I/O Card wr Serral , Game and Parallel Printer Port [ATI.,,,., .... Ideal lor work with electrical wiring 1 electronic drcuitry. New - $19.95 High Intensity replacement bulbs avail.

Just try to catch a100-ns glitch with cal- culus and figure where it came from! 3 shows pin 7 of 1C3 (the 555 astable) connected to R13 or R14 via switch S3-b, with both potentiometers grounded. The 4-page "Vid- eo Formats and Required Load Terminations," the 2- page "Improved PCB Layouts for Video RAD- DAC's Can Use Either PLCC or DIP Package Types," and the 1-page "Changing Vour VGA Design from a 171/176 to an ADV471" all include waveforms, diagrams, and tables relating to the use. CIRCLE 19 ON FREE INFORMATION CARD The monolithic devices can be used in compliance with various international standards that specify video levels used in television and video monitors.

1 9.95 JE1060 I/O Card w/Senal, Game. .95 JE10S1 RS232 Serial Half Card (PCOST) .95 JE1062 RS232 Serial Hall Card (ATI .95 J E1 065 I/O Card wr Serral , Game and Parallel Printer Port [ATI.,,,., .... Ideal lor work with electrical wiring 1 electronic drcuitry. New - .95 High Intensity replacement bulbs avail. Just try to catch a100-ns glitch with cal- culus and figure where it came from! 3 shows pin 7 of 1C3 (the 555 astable) connected to R13 or R14 via switch S3-b, with both potentiometers grounded. The 4-page "Vid- eo Formats and Required Load Terminations," the 2- page "Improved PCB Layouts for Video RAD- DAC's Can Use Either PLCC or DIP Package Types," and the 1-page "Changing Vour VGA Design from a 171/176 to an ADV471" all include waveforms, diagrams, and tables relating to the use. CIRCLE 19 ON FREE INFORMATION CARD The monolithic devices can be used in compliance with various international standards that specify video levels used in television and video monitors. Figure 1 in the sidebar on page 40 shows pin 7 connected to the collector of an internal NPN transistor. The first note describes and com- pares some of the more common standards and de- tails the required load ter- minations for the video RAM-DAC's. Discover, Explore, Experience for Yourself— 15-Day Trial. As you add additional boards, you create increasingly complex circuits easily and quickly, bringing today's electronics concepts to life. M Y //7SS RADALERT TAKES OFF You made a real contribution when you published the "Radalert" articles in the June and July 1988 issues of Radio-Elec- tronics.In all ways, the Contem- porary Electronics Series is an exciting learning experience that offers you the quickest and least expen- sive method available to master today's electronics. To order your first module for a 15-day trial examination, simply complete the card and send today! I was glad to see a follow- up article in the June, 1989 issue.

Rest assured, Pomona delivers — on time — e broadest and most varied selection of precision test ccessories in the industry. Mail materials to: mini-AOS, RADIO-ELECTRONICS, 500- B Bi-County Blvd., Farmingdale, NY 11735. The most recent occurrence was in an article by Ray Marston on os- cillators in the July 1989 issue. S-hir couniertfmers On-chip osci LI, accepts crystal or external clock drive; 1,5V power supply. We carry a complete line of Computer & Game Accessories and Equipment ... Building a circuit to remove colorburst before the video is fed to a monochrome monitor is exactly like putting a 30-k Hz notch filter on your stereo. CIRCLE 75 ON FREE INFORMATION CARD GET YOUR RECHARGE CATALOG FREE. EARN BIG $$ IN YOUR SPARE TIME — All supplies and Do- It- Yourself kits with complete instructions available. In time, maybe we can find out whether there is real danger or just unquantified alarmist reporting. As the plane flies up to cruising altitude, the count per minute goes up from about 12, which is background, to 380!It might get rid of the signal but, since you can't hear it anyway, why bother? Sup- plies cost from .95 in qty and you can sell recharged toner cartridges for .00 to .00 each. The reason is that much more cosmic radiation reaches you because there is 10 pounds less air per square inch to shield you. I left the Radalert in the carry-on luggage, turned on, as it went through the x-ray machines.If you have a scope, you can compare some real NTSC signals with the output of your computer and see the difference yourself. NEON WOES I'm building a small project for school and I would like to use neon lights as indicators instead of LED's. If, however, you want to light small neon bulbs, the circuit in Fig. Just make sure you use good-quality neon bulbs, because cheap ones usually need more voltage than Fig. Be careful when you build it, be- cause there's enough voltage on the neon side of the transformer to give you a nasty shock. When encoding the RGB signals from the Amiga computer into an NTSC video signal, the Supergen genlock does not require an exter- nal video signal. - Panasonic #JU-363-1»ltefn#2H75 NEW Full Height — Capacitance: 1.0 Mb (tmlormalted); 3 ms access time. Removed Hom operational computers, rested — Like Netrl HEC #FD 1035 hem #17171 .00: 2 t r 0.00 PROTOTYPING DEVICE w/EPROM INTERFACE — (Z8603) Complete microcomputer 'J 2Kb ROM: 123 Dytes RAM; 32 LO lines: up to 62Kb addressable extern, space ea.; 144 byte reg. The problem is that my circuit is powered by a nine-volt battery and I can't figure out how to light the neon with that voltage. If the bulb flickers, try dropping the frequen- cy of the 555 or leave it alone and try a different bulb. Both Q1 and Q2 are set up as switches and their operation is controlled by the logic level pres- ent at the base of Q1. With no external signal, the genlock acts as an RGB- to-NTSC encoder, and the dissolve sliders have no effect on the out- put.

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If the card is missing, write to us for ordering information. The former is what determines how bright the pic- ture will be and the latter con- trols what colors will be seen. I bought a set and would like to re- late some casual experiences, be- cause here — finally — is a practical, portable instrument that gives you actual numbers, which can be used for meaningful comparisons.

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