табличка перевода децибел милливольт (микроватт) в мощность и напряжение

(будет здесь)

как более привычно ? – например модем выдает 53 dBmv а кабель 75 ом – может более привычно пересчет что это 2.7 ватта и передатчик до +100 градусов нагреется .. непорядок где то сигнал плохо проходит.

скрипт для рассчета mc34063 здесь уже

с десяток схем не перевожу – все понятно

Circuits RadioOne Watt 2.45 GHz …

One Watt 2.45 GHz Linear Amplifier

04-20-2010

RF Micro Devices RF2126

Schematic:

Reversed PCB pattern:https://search.supplyframe.com/partner/17/searchAd728x90/

BOM:

	Schematic Reference	Value	Description	Package
Capacitors	C1	1 µF	electrolytic, 10%, 16V	SMT or leaded
C2, C3	1000 pF	ceramic, X7R, 50V	0603 SMT
C4	22 pF	Johanson ceramic 5%, 100V	0504 SMT
C5	3.3 pF	ceramic, ±0.25 pF, 50V NP0	0402 SMT
C6	2 pF	ceramic, ±0.25 pF, 50V NP0	0402 SMT
C7	1.8 pF	ceramic, ±0.25 pF, 50V NP0	0402 SMT
C8	1.6 pF	ceramic, ±0.25 pF, 50V NP0	0402 SMT
Inductors	L1	4.7 nH	2%	0603 SMT
L2	31 ohm @ 100 MHz	ferrite bead, IDC 500 mA	1206 SMT
Resistors	R1	2200 ohm	film, 5%	0603 SMT
R2	1000 ohm	film, 5%	0603 SMT
Integrated Circuits	ICI	RF2126	RF Micro Devices 1 Watt 2.4 GHz power amplifier	SOP-8
Other	J1, J2		PCB mount SMA jacks

Notes:

Part numbers are for reference only. Alternate components may be substituted.

It’s also possible to run the RF2126 at around 6.5 volts for slightly more power output. You could try a 7805 voltage regulator with two silicon diodes (or a red LED) in series with the ground lead (cathode to ground).

Be sure to isolate the ground tab on the 7805 though or it won’t work. You can even just use a plain old 7806 voltage regulator for 6 volts output.

qsl.net

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Circuits Measurement Microcontrollers UsageVery Accurate LC Meter …

Very Accurate LC Meter based on PIC16F84A IC

10-30-2007

This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself. This LC Meter allows to measure incredibly small inductances starting from 10 nH to 1000 nH, 1 uH to 1000 uH, 1 mH to 100 mH and capacitance from 0.1 pF up to 900 nF. LC Meter’s circuit uses an auto ranging system so that way you do not need to spend time selecting ranges manually. Another neat function is the “Zero Out” switch that will reset the initial inductance / capacitance, making sure that the final readings of the LC Meter are as accurate as possible.https://search.supplyframe.com/partner/17/searchAd728x90/

click for enlarge

LC Meter Part’s List: 2x 1 K
2x 6.8 K
1x 47 K
3x 100 K
1x 10 K POT 2x 10 pF
1x 100 pF
2x 1 nF
2x 10 uF
1x LM7805 1x 16 x 1 LCD Display
1x PIC16F84A IC
1x LM311 IC
1x 4 MHz Crystal
1x 82 uH Inductor
1x 3 V Reed Relay

LC Meter’s Technical Specifications: Voltage Supply: 7.5 – 15 V
Accuracy: 1%
Zero Out Switch
Automatic Ranging

LC Meter’s Inductance Measurement Ranges:
– 10 nH – 1000 nH
– 1 uH – 1000 uH
– 1 mH – 100 mH

LC Meter’s Capacitance Measurement Ranges:
– 0.1 pF – 1000 pF
– 1 nF – 900 nF

LC Meter Inductance Meter Capacitance Meter

About LC Meter

This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself. This LC Meter allows to measure incredibly small inductances starting from 10 nH to 1000 nH, 1 uH to 1000 uH, 1 mH to 100 mH and capacitance from 0.1 pF up to 900 nF. LC Meter’s circuit uses an auto ranging system so that way you do not need to spend time selecting ranges manually. Another neat function is the “Zero Out” switch that will reset the initial inductance / capacitance, making sure that the final readings of the LC Meter are as accurate as possible.

LC Meter Kit with Green Backlight LCD Display

How does LC Meter Work?

To be able to determine the value of an unknown inductor / capacitor we can use the frequency formula given below.

Note that there are three variables that we can work with; f, L and C (f represents a frequency, L inductance and C capacitance). If we know the values of the two variables we may calculate the value of the third variable.

Lets say we want to determine the value of an unknown inductor with X inductance. We plug X inductance into the formula and we also use value of a known capacitor. Using this data we can calculate the frequency. Once we know the frequency we can use the power of the algebra and rewrite the above formula to solve for L (inductance). This time we will use the calculated frequency and a value of a known capacitor to calculate the inductance.

Isn’t this amazing? We just calculated the value of unknown inductor, and we may use the same technique to solve for the unknown capacitance and even frequency.

Applying the Theory to LC Meter’s Hardware

Now let’s use the above theory and apply it to electronics. The LC Meter uses a popular LM311 IC that that functions as a frequency generator and this is exactly what we need. If we want to calculate the value of an unknown inductor we use a know Ccal 1000 pF capacitor and the value of an unknown inductor. LM311 will generate a frequency that we can measure with a frequency meter. Once we have this information we can use the frequency formula to calculate the inductance.

The same thing can be done for calculating the value of a unknown capacitor. This time we don’t know the value a capacitor so instead we use the value of a known inductor to calculate the frequency. Once we have that information we apply the formula to determine the capacitance.

All this sounds great, however if we want to determine the value of a lot of inductors / capacitors then this may become a very time consuming process. Sure, we can write a computer program to do all these calculations, but what if we don’t have an access to a computer or a frequency meter?

That’s were PIC16F84A microchip comes handy. PIC16F84A is like a small computer that can execute HEX programs that are written using an assembly language. PIC16F84A is a very flexible microchip because it has PINs which can be configured as inputs and outputs. Besides that, PIC16F84A IC requires very minimal number of external components like 4 MHz crystal / resonator and few resistors depending on what project we are building. Before we can use PIC16F84A microchip we have to program it with a HEX code which has to be sent from the computer.

In the next step we use the frequency generated by LM311 IC and pass it on to PIC16F84A’s PIN 17. We designate this PIN as an input, as well as all other PINs that are directly connected to switches and jumpers. User can use these inputs to tell the microchip to execute specified set of instructions or perform calculations.

Once the microchip will calculate the unknown inductance or capacitance it will use PINs that are designated as outputs and pass the results on to the 16 character LCD display.

LC Meter’s Switches & Jumpers

SW1 – Zero out the readings.
SW2 – Capacitance / Inductance switch.
J3 – turns on the backlight on LCD displays that have LED backlight.
J1 – used by 16×2 two line character LCD displays.
J2 – displays the initial frequency of the LM311 oscillator which should be around 550 KHz.

Character LCD Display Connections

Most of the character LCD displays have 14 or 16 PINs. The displays that do have a backlight have 16 PINs and displays that do not have a backlight have 14 PINs. The PINs that are highlighted in green in the table below are the ones that PIC16F84A uses to pass the output information represented in bits (0/1).

PIN Symbol Function States 1 VSS GND – 2 VDD VCC +5V + 3 VO Contrast Adjustment +/- 4 RS Register Select H/L 5 R/W Read / Write H/L 6 E Enable Signal H/L 7 DB0 Data Bit 0 H/L 8 DB1 Data Bit 1 H/L 9 DB2 Data Bit 2 H/L 10 DB3 Data Bit 3 H/L 11 DB4 Data Bit 4 H/L 12 DB5 Data Bit 5 H/L 13 DB6 Data Bit 6 H/L 14 DB7 Data Bit 7 H/L 15 LED Backlight VCC +5V + 16 LED Backlight GND –

CAUTION: The controller chip that is visible on the back of the LCD display can be damaged with the static energy. Make sure to ground yourself every time you hold it, and handle it by the edges and not the PINs.

LC Meter’s Enclosure (4″ x 2.5″ x 1″)

LC Meter’s Construction

Measuring 2 pF Capacitor

Measuring Inductance

Final Recommendations

1nF Ccal is used as a calibration capacitor so make sure that you use a good quality mylar capacitor. Keep the cables between LM311 and the terminals as short as possible to keep the stray capacitance to minimum and ensure the highest accuracy. Also, you have to use a “5V reed relay” because the current passed from PIC16F84A is very small. Reed relays require very minimal amount of current to be switched. I also suggest that you use a 7805 IC to protect the LC Meter, in case you accidentally apply a higher voltage. PIC16F84A will be damaged if you apply voltage higher than 5.5 V.

Before PIC16F84A microcontroller can be used it needs to be flashed with the following HEX program LC_METER.HEX .

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if not difficult someone send in my address PCB, [email]m777r@bk.ru[/email], please!:) Thank You
hi, please,PCB send my the address [email]matrak81@mynet.com[/email] thank you..
ples send to me pcb
Thank you all for the effort is clear and I will try to assemble circuit
[SIZE=”3″][/SIZE]Thank you very much for the effort and now trying to assemble electronic circuit
where can i get the pcb?:confused:
According to numerous requests from users … A lot of information found on one Russian site… [URL=”http://yl2gl.ucoz.net/news/konstrukcija_prostogo_izmeritelja_lc/2011-01-09-62″]Very Accurate LC Meter based on PIC16F84A IC[/URL] See attachments… Good luck!
Lot of thanks Vadzz…:)
You’re welcome. 🙂 If that does not make problems, please tell results during construction. For all users: Share your projects and concerns. Thank you.
i’ll gladly do so..but currently still buying its component..as soon as i started the construction, i’ll post the progress. i also hope to improve the circuit if i’m able to do so.
[FONT=Courier New]This mail from India ,I make this project .this works very clearly. thank you,[/FONT]
hallo! I am trying to change .rar files to .hex , but I dont know how? I downloaded this file, but a programmer dont recognize it? Could someone explane where and how I must change the sufix? Thanks! Brko
Do You know, that *.rar is the archive file? You can unpack this one with [url]http://www.win-rar.ru/download/[/url]
THANKS
im cant pcb layot would pcb to pdf tnx
[URL=”http://uplod.ir/e1k1eldjkeyz/25_PCB_LC_Meter.pdf.htm”]down[/URL] [URL=”http://uplod.ir/m9o8docqh0dy/LC_Meter.pdf.htm”]down1[/URL] [IMG]http://uplod.ir/m9o8docqh0dy/LC_Meter.pdf.htm[/IMG] [IMG]http://uplod.ir/e1k1eldjkeyz/25_PCB_LC_Meter.pdf.htm[/IMG]
im not part list.send for me partlist
Can you please tell me what are the specifications of this board? How i can program the PIC? Also how i can design its related circuit? [URL=”http://www.7pcb.com/Prototype-PCB-Assembly.php”]prototype assembly[/URL]
with the help of programmer PIC controller…
please help i can’t download any attachment 🙁

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Circuits Microcontrollers Usage Measurement50 MHz frequency counter, …

50 MHz frequency counter, voltage meter & SWR/PWR indicator

07-09-2010

This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876. The later is capable of driving 4 digit LED display in multiplexed mode while measuring frequency, power supply voltage as well as handle two analog inputs to display SWR/PWR signal strength in a bargraph manner. There is no need for external LED display driver chip as well as external data EEPROM since it is already implemented in PIC16F876. Reduction in the number of used chips also results in smaller dimensions of the counter compared to its predecessor.https://search.supplyframe.com/partner/17/searchAd728x90/

Click to enlarge

Circuit schematic

Click to enlarge

PCB

The latest software version (V1.1) supports following functionality:

Measurement of the frequency up to 50MHz
Measurement of power supply voltage in the range of 0.0 V … 25.5 V
Measurement of the input voltage at two analog inputs, simultaneously displayed as bargraph (PWR/SWR or S) indicator. The input sensitivity could be chosen between 0.25V, 0.5V, 1.0V and 2.0V for maximum bargraph indication.
Power save mode: Automatic display shut-down in case the push-button action or frequency change does not occur for a certain time. Display switches on again after frequency change or push-button action. The available shut-down time periods are 3s, 10s, 30s, 60s, 120s, 180s and 240s. This function can be disabled in set-up menu.
Programmable frequency offset added or subtracted from measured frequency, settable in the range of 0 to 99,999.9 kHz. This is convenient for use with heterodyne type of RX/TX
Different display modes: XX.XX MHz, X.XXX MHz, XXX.X kHz
Display resolution 100 Hz
Measurement resolution 12,5 Hz
Hysteresis of displayed value 25 Hz

In operating mode a push-button allows the user to choose between the frequency, bargraph or supply voltage to be displayed. The frequency display mode can also be changed with longer (>1s) push-button pressing. For example if the frequency to be displayed is 14.065.9 MHz the user will see on the four digit display either “065.9”, “4.065” or “14.06”. The default display mode after power-up can be changed in the set-up menu. The set-up menu is entered at power-up while holding the push-button pressed.

The production of Siemens’s (now Infineon’s) miniature 7 seg. LED HDN1077 displays in low current version (suffix O) was abandoned recently. Therefore I’ve designed another display PCBoard which suits the same f-counter base board but uses newer Agilent’s HDSP-U103 miniature 7 seg. LED displays. Their current consumption is even smaller. They need no more than 0,5mA per segment for acceptable brightness. Assuming that during normal operation in average only one half of the segments lights, the average current consumption of the counter is about 20mA. In power-save mode the consumption reduces to less than 10mA which is important in case of battery powered equipment.

The latest software version of the frequency counter is for radio-amateur and non-commercial use downloadable from this page for free. The PIC controller is in-circuit programmable if the MC34064 reset circuit is not soldered to the PCB. The instalation of this IC is strongly recommended after the frequency counter has been built and tested.

Downloads:

HEX code, V1.11 (operates with 4,000 MHz quartz)
Hex code, V1.12 (operates with 4,1943 MHz quartz)

lea.hamradio.si

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прошивка во вложении s lc-meter

Врати

Very Accurate LC Meter based on PIC16F84A IC.

23:50 ч. Публикувано от Unknown
Етикети: измервания, PIC

Список деталей:
2x 1K
2x 6.8K
1x 47K
3x 100K
1x 10K переменный резистор
2x 22pF
1x 56pF
1x 100pF
2x 1nF
2x 10uF
1x 16×1 LCD дисплей
1x PIC16F84A IC
1x LM311 IC
1x 4 MHz Crystal
1x 82uH Катушка
1x 3V Геркон
Программу можно закачать тут.
Технические спецификации:
Напряжение питания: 5V
Точность: 1%
Система сброса
Автоматический выбор диапазона
Область измерения индуктивности:
– 10nH – 1000nH
– 1uH – 1000uH
– 1mH – 100mH
Область измерения емкости:
– 0.1pF – 1000pF
– 1nF – 300nF

LC Meter Kit with Green Backlight LCD Display

16×1& 16×2 LCD modules with backlight (front) both LCDs can be used interchangeably
LCD modules (back) 16×1 LCD with pcb standoffs and header pins

LC Meter’s Enclosure (4″x2.5″x1″)

LC Meter’s Construction

Measuring 2pF Capacitor

Measuring Inductance

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16 x 1 & 16 x 2 LCD modules with backlight (front)	both LCDs can be used interchangeably


LCD modules (back)	16 x 1 LCD with pcb standoffs and header pins


40 nH – small piece of magnet wire	80 nH – 4 turns of magnet wire


90 nH coil used in FM transmitter	280 nH – 10 turns of magnet wire


500 nH wire through choke	1 uH VK choke


small RF toroid, 5 turns	medium toroid


365 uH	100 uH choke


Latest PCB version