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1. (jCommunity Group) Tuesday, 31 December 2069 2. How to make Printed Circuit Boards. (MyBlog/TB-Articles) ... a little too small really. Component pad holes for transistors, IC’s and resistors etc should be around 0.8mm. Power diodes, bridge rectifiers, TO220 transistors and voltage regulators, Molex connectors ... Sunday, 11 October 2009 3. New eSi-RISC Scalable Soft Processor Cores for ASICs and FPGAs (MyBlog/TB-Blog) ... configurable and low-power soft processor cores – the eSi-1600, eSi-3200 and eSi-3250 - to its customer IP portfolio. The new processor cores are available immediately for deployment as part of EnSilica's ... Tuesday, 17 November 2009 4. PC Controlled DC Motor – Keyboard Control (MyBlog/TB-Tech-Tips) ... TR5 and TR6 (type 2SC1483, or perhaps a BC548 or equivalent – ARW) are used to interface the power driver stage to the parallel port of the PC. The data bits D0 and D1 (pin 2 and pin 3) of the parallel ... Thursday, 17 September 2009 5. Power Supplies 101 – Safety, Transformers & Primary Windings (MyBlog/TB-Articles) Introduction. In this series of articles were going to be looking at mains powered linear power supplies (PSU’s). Before we start, a word of caution. You should already be aware that the domestic mains ... Saturday, 21 November 2009 6. Turn your car into a hybrid (MyBlog/TB-Tech-Tips) ... Kit could go 30 miles on battery power alone. Target kit cost is $3,000 to $5,000—so you figure out the payback period for your car. Perry's invention received first prize in a green energy competition ... Monday, 07 September 2009 7. Mobile Phone Switch – Freely phone home and control an appliance (MyBlog/TB-Tech-Tips) ... its screen to light up, a lightdependent resistor (LDR) detects this and triggers a flip-flop (IC1) which turns a relay on or off, thus controlling the power to whatever is connected to the relay contacts. ... Wednesday, 09 September 2009 8. A LED Ultra-Violet (UV) PCB Exposure Unit (MyBlog/TB-Articles) ... coating of a UV sensitive photo resist layer. This photo resist layer is very sensitive to UV light in the 340nm to 420nm wave lengths. Traditional UV exposure units use special mains powered UV tubes ... Wednesday, 23 September 2009 9. 12V Sealed Lead/Acid Charger – Cyclic Battery Use (MyBlog/TB-Tech-Tips) ... open circuit voltage across pins 2 and 5 of theL200 (with power applied to its input). This is the reference voltage and should be in the region of 450mV which is divided by therequired output current ... Thursday, 17 September 2009 10. Microchip's 44 Pin Demo board - what to do with it once you've flashed the LED's (MyBlog/TB-Articles) ... short circuits. The other “enhancement” to complete is the bending of the Demo Boards LED power jumper; you can see this jumper in figure 3 on the left hand side. This jumper when fitted allows power ... Thursday, 10 September 2009 11. Two-stroke engine rebirth? (MyBlog/TB-Blog) EcoMotors OPOC internal combustion engine is an update of two-stroke powerplants. The acronym stands for opposed piston opposed cylinder, which describes a "module" consisting of a pair of pistons moving ... Wednesday, 13 January 2010 12. Volvo debuts new tech turbo (MyBlog/TB-Blog) ... produces 203 hp and 300 Nm (221 lb-ft) of torque, with 320 Nm (236 lb-ft) in an overboost condition. "We've succeeded in making a four-cylinder engine that is as powerful as a 2.5-litre 5-cylinder unit, ... Friday, 29 January 2010 13. Gray Codes (Part 2) (MyBlog/TB-Articles) ... preventing intermediate states, Gray code counters consume only half the power of an equivalent binary counter and they generate correspondingly less noise. Actually, while the power and average noise ... Sunday, 06 September 2009 14. Zener Diode Tester - A tap on the knee (MyBlog/TB-Tech-Tips) ... current limiter. VR1 is then adjusted until the LED D10 illuminates to indicate that current is flowing, when the test voltage may be read. The circuit operates from a mains power supply. To measure diodes ... Tuesday, 01 September 2009 15. Linear Technology’s LT3743 Synchronous Step-Down LED Driver Delivers 20A+ of Continuous LED Current (MyBlog/TB-Reviews) High efficiency, 2μsec switching capability and compact size allow LEDs to replace incandescent light sources in theater-class DLP Projectors & architectural lighting. Linear Technology’s high-powered ... Friday, 23 October 2009 16. Positive Versus Negative Logic (MyBlog/TB-Articles) ... 5). Figure 5. The physical mapping of a PMOS gate. Circuits constructed using the original PMOS transistors typically made use of a negative power supply; that is, a power supply with a 0V rail and ... Wednesday, 23 September 2009 17. Brushless Fan Speed Control – Fine Tuning (MyBlog/TB-Tech-Tips) ... to operate, so it simply stops. Much lower speeds can be achieved with a pulse-width modulated (PWM) supply where the power is applied as brief pulses of the full supply voltage, with a constant frequency ... Thursday, 17 September 2009 18. Breadboard Project Protector – Power Cut (MyBlog/TB-Tech-Tips) ... who does not have the luxury of a power supply with built-in current limiting. The device is used as an add-on and wired between a “home-made” power supply, i.e. a simple transformer-rectifier-smoothing ... Tuesday, 15 September 2009 19. Analysis: M14K and M14Kc MCU cores (MyBlog/TB-Reviews) ... and M14Kc offer significant advantages in cost, power, and performance. However, MIPS must overcome ARM’s big head start in 32-bit MCUs. Review: The new M14K and M14Kc cores are strong entries into the ... Tuesday, 03 November 2009 20. The Life and Work of Konrad Zuse (Part 7) (MyBlog/TB-Articles) ... Berlin on April 1, 1940. The Zuse Apparatebau was a small company located in the Methfesselstraße 7 and 10 in Berlin-Kreuzberg. By 1941, Konrad Zuse was sure that the general problems of building powerful ... Wednesday, 04 November 2009
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