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Despite the absence of its namesake, superchef Jean-Louis Palladin, the glitzy new superbistro Palladin just off Times Square is rounding into form.
The arrival here of chef Palladin, whose restaurant JeanLouis at The Watergate was considered Washington's top French spot, was eagerly awaited. But it is proving a nonevent. Seems the man has bigger fish to saute in his Las Vegas restaurant and a possible midtown Manhattan restaurant in the future.
Regardless of his physical location, he is clearly acting to deflate early critics of the site in the new boutique hotel The Time. While still lacking a clear persona, its food is impressive, and service improves daily.
Palladin is expensive, but a $22 three-course lunch is a huge value and highly recommended.
Executive chef Timothy Dean spent 10 of his 29 years with chef Palladin at The Watergate. He has a steady hand at producing the intensely flavored and visually vibrant food. He also surveys the 90 seats on the other side of the glass window, and acts to see that someone needing service gets it.
Mr. Palladin recently reeled in a former service star from his Washington days, Laura Williams. She now manages the restaurant, teaming with sommelier Dawn Lamendola in a one-two punch of customer-cosseting.
Adam Tihany designed the hotel and restaurant with a cool, contemporary eye. Soft peach walls, purple suede chairs and glassy surfaces are key ingredients. An unplanned-for extra is the aurora borealis effect of strip lighting in a parking lot across the street. Shutters after dark would help.
Palladin's is a short, well-realized menu of verve and originality.
Among appetizers ($8 to $18), I love cold red and yellow heirloom tomato soup poured simultaneously from two teapots over rock shrimp to create equal color fields. You'll never have to force Junior to eat spinach after he tries "young spinach salad," combining diced foie gras, duck confit, poached quail eggs and chorizo. Outstanding! Asparagus soup with lobster tartare, and an endive salad with diver scallops and young carrots perfumed with cumin are two other fine openers.
Pan-seared wild striped bass gets the buds atingle when plated atop buttery mashed potatoes surrounded in truffle emulsion. Pan-seared salmon is another home run when wed with robust vegetable risotto. Dishes are thoughtfully and harmoniously composed with taste foremost.  Young pea ragout and pearl onions are running mates for braised veal cheeks, and a potato, cabbage and pancetta cake meshes well with roast chicken. In each case, reads well, eats well.
Desserts ($8 to $10) are paced by a banana trifecta -- tart, flan and ice cream; a lemon tart in cookie crust, sometimes done with chervil ice cream but more compellingly with lime ice cream; and a remarkable caramel-cashew cheesecake.
The latter is served in a chocolate tube with caramel sauce and chocolate ice cream. It's the first cheesecake that left me lusting for more rather than sated and bulging in all directions.
The wine list is large and intriguing, and Ms. Lamendola's advice on target.
Palladin: a superbistro with food that is often fun as well as delicious.
Hours: Breakfast, seven days, 7-10 a.m.; Lunch, Sun.-Fri., noon-2:30 p.m.; Dinner, seven days, 5:30-11 p.m.As we all know, low-power regulated power supplies are widely used electronic equipment in electronic system testing. However, this low-power power supply still has some inconvenience to use. For example, most of these power supplies have fixed voltage output or adjustable voltage, but there is no intuitive digital display.
The voltage adjustment accuracy can reach 0.25 level.
In summary, the LM317 regulated power supply has the characteristics of high output accuracy, easy adjustment and intuitive display.
How to Configure the LM317 Voltage Regulator?
The low output power DC power supply is the necessary electronic equipment for using, testing and overhauling electronic products. It can ensure the supply of high-power electrical appliances when the load changes or the power grid fluctuates. This is reflected in two aspects: smooth working voltage output and sufficient load current drive capacity.
At present, the common low-power stabilized power supplies generally have a fixed voltage output or although the voltage is adjustable, there is no intuitive digital display, which brings inconvenience to users. Therefore, the use of low-cost stabilized chips and digital display modules to design and manufacture miniaturized low-power DC stabilized power supplies with adjustable output and digital display functions has universal application significance and use value for electronic system debugging and laboratory testing.
The display accuracy reaches 0.25 level standard.
In each part of the unit circuit of the DC stabilized power supply, the power transformer reduces the input power to a suitable AC voltage through the power isolation transformer. For multi-channel power output, you can consider using a dual-winding multi-winding output transformer. The power of the power transformer is based on the design output power of the DC power supply.
The rectifier circuit adopts a bridge rectifier module and a rectifier tube to form a full-wave rectifier circuit, which rectifies the alternating current after voltage transformation into direct current with pulsating components. The inverted LC filter is used in the filter circuit to filter out the pulsating AC component, eliminate the ripple and output a smooth DC voltage.
The voltage stabilizing and adjusting circuit adopts the three-terminal integrated voltage stabilizing chip LM317 to perform filtered stabilization. When the load changes or the power supply voltage fluctuates, it can output a stable DC voltage. And change the variable resistance of the adjustment end of LM317 to realize the adjustment of the output power supply voltage to reach the predetermined output power supply voltage.
DC power supply output voltage detection uses the on-chip ADC of the microcontroller to detect the output voltage in real time. It converts the output power voltage into a digital quantity and displays it in real time by the LCD display circuit. The display circuit adopts a character-type liquid crystal module to display. After the digital quantity converted by ADC is processed by the controller, the liquid crystal is driven to realize the digital display of the output voltage value of the power supply.
The maximum output of DC voltage is 15V. Considering that the three-terminal integrated voltage regulator has a voltage drop of about 1 to 2V, the voltage Uc after the capacitor is filtered is about 17V. Then the effective value of the secondary secondary output voltage of the transformer is U2=Uc/1.2=17V/1.2=14.2V. Because it is a low-power power supply, we choose a small 15V/20W power transformer.
The average ID of the current through the rectifier diode.
Here, we choose IN4007 rectifier diodes to form a full-bridge rectifier circuit.
The parameters of its forward average current of 1A and withstand voltage of 1000V meet the rectification requirements. And, the filter capacitor has an empirical value of 470~1000μF. In order to suppress the ripple, an electrolytic capacitor with a nominal value of 1000μF with a voltage of 25V is selected.
In this design, LM317 can be debugged and integrated three-terminal regulator as a regulator chip and realize the adjustment function of the output voltage. LM317 has the characteristics of continuously adjustable output voltage and wide adjustment range. Compared with other regulators, its linear regulation rate and load regulation rate have obvious advantages.
There are over-current protection circuits and safety zone protection circuits inside LM317. Its output voltage is 1.25~37V, and the load current can reach 1.5A. The LM317 output voltage is easy to adjust, and only two external resistors are needed to set the output voltage. In order to improve the transient response, a capacitor can be connected in parallel at the output.
It has the functions of over-current protection, over-heat protection, output short-circuit protection, and regulator safety zone protection.
The output adjustable voltage stabilizing circuit design based on LM317 is shown as in Fig. 2.
Considering the minimum output current, the minimum operating current when LM317 works normally is generally 1.5mA, and R1 is the only path through which the minimum current is discharged when there is no load.
If the value of R1 is selected too large, there will be a big difference between the output voltage under no load and under load, which is not allowed.
Taking U0=15V, we can get Rp/R1=11. Knowing that R1 can work normally when the current reaches 1.5mA, it is necessary to find that R1 should be less than the resistance limit range of 830Ω, so R1=120Ω. Then the corresponding Rp resistance value should be 11×0.12kΩ=1.32kΩ, which can ensure that the power output reaches 15V. The nominal value of 2.2kΩ potentiometer is used for Rp to adjust the output voltage.
D1 and