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Moon Jellyfish Frequency Analyzer and Display Driver Narkidae.com Revised May 2015 1 Features: • • • • • • • • One Frequency Band Per Board o Easy to Set 5th Order Band-pass Filter o Set With Two Resistor Values and One Capacitor Value On Board AC–DC Filter for: o Voltage Controlled Display o Microcontroller Sampling Selectable AC or DC Output o Jumper Can Bypass AC–DC Filter PWM Brightness Control for Voltage Controlled Displays Adjustable Output Gain o 1V/V to 101V/V Wide Power Supply Range o Single Supply 4.8V to 30V o Dual Supplies 2.4V to 15V Daisy Chainable o Up to 16A Total System Current All Standard Components Included o User Provides Frequency Setting Resistors o Band-pass Filter Capacitor Provided 2 Applications: • • • Frequency Band Visualizer Microcontroller Frequency Analysis General Purpose 5th Order Band-pass Filter 3 Description: The Moon Jellyfish is a frequency analyzer and display driver board. Frequency analysis is accomplished with a 5th order band-pass filter. This filter is easy to set, with only two resistance values and one capacitance value necessary. Following the band-pass stage, the signal can either be fed strait to the output or filtered to a DC value for microcontroller sampling or display driving. This selection is made with a simple solder jumper. Also on board is a parallel set of n-channel MOSFETs that can be used to PWM a display to control the brightness. The Moon Jellyfish is designed to be daisy chained with a maximum of 16A total system current. Moon Jellyfish Frequency Analyzer and Display Driver Revised May 2015 4 Table of contents: 1 Features 2 Applications 3 Description 4 Table of Contents 5 Kit Contents 6 Specifications 7 Pin Configurations and Functions 8 Detailed overview 9 Application Information 10 Schematic 1 1 1 2 3 4 5 6 7 8 Narkidae.com Moon Jellyfish Narkidae.com Frequency Analyzer and Display Driver Revised May 2015 5 Kit Contents: Qty 1 1 Value BAT85 Green Parts D1 LED1 1 100Ω 5% 1/4W 680Ω 5% 1/4W 1,000Ω 5% 1/4W 10,000Ω 5% 1/4W 18,000Ω 5% 1/4W 100,000Ω 10% 1/2W R12 2 BS170 (note 1) Q1, Q2 1 LM324 IC1 2 2 position 5mm Pitch17.5A JP1, JP2 2 3 position 3.5mm Pitch 17.5A JP3, JP6 2 0.01uF 5% 100V 5P C1, C2 1 0.1uF 10% 50V 2.5P 1uF 10% 25V 5P C6 47uF 20% 35V 2.5P C3, C4, C8 1 3 6 1 1 2 3 Picture Brown Black Brown R6 Blue Gray Brown R4, R5, R8 Brown Black Red R7, R9, R10, R11, R13, R14 R15 Brown Black Orange Brown Gray Orange R16 C5, C7 (1) See “Moon Jellyfish BS170 pin-out to PCB” note Moon Jellyfish Narkidae.com Frequency Analyzer and Display Driver Revised May 2015 6 Specifications: Absolute Maximum Ratings (Ta = 25C) All voltages referenced to GND Min -0.3 Supply Voltage [VCC] Large Screw Terminal [VCC], [GND] (1) Small Screw Terminal [VCC], [GND] (1) Signal Input [SIG_IN] PWM Input [PWM_IN] -18 PWM Output Current [PWM_OUT] Operating Temperature (Ta) TBD (1) Total Vcc or GND current should not exceed 17.5A Recommended operating conditions (Ta = 25C) All voltages referenced to GND Min Supply Voltage [VCC] 4.8 Large Screw Terminal [VCC], [GND] Signal Input [SIG_IN] PWM Input high [PWM_IN] 4.5 PWM Input low [PWM_IN] 0 PWM Output Current [PWM_OUT] Max 32 17.5 14 VCC/2.2 20 -1 TBD Unit V A A Vpp V A °C Max 30 16 (Vcc-3)/2.2 18 0.8 -0.8 Unit V A Vpp V V A Moon Jellyfish Frequency Analyzer and Display Driver Narkidae.com Revised May 2015 7 Pin Configurations and Functions PIN Name Name No GND 1 SIG_IN 2 PWM_IN (1) 3 Type Power Input Input Description VCC (large connector) GND (large connector) PWM_OUT 4,7 Power Used for connecting ground of signal source Input signal to be analyzed Pulse width modulated signal input for controlling display brightness. This pin can be left floating if Vcc > 7 (PWM_OUT low) Positive power supply 5,6 Power Negative power supply 8 Output SIG_OUT 9 Output Used for controlling return current from the display. State controlled by PWM IN. Signal after analyzing. Can be either AC or filtered DC (for driving voltage controlled display) by using the solder jumper on the bottom of the board Used for supplying positive power to the display VCC (small 10 Power connector) (1) PWM IN Can be left floating: PWM OUT will be low if Vcc > 7 Moon Jellyfish Frequency Analyzer and Display Driver Narkidae.com Revised May 2015 8 Detailed Description: Setting the Frequency: The frequency is set by using the equations. R1, R2, and R3 depend on frequency and will need to be supplied by the user. C1 and C2 have been provided and are 0.01uF 5% capacitors. Solve the first equation for R by plugging in your desired center frequency (F0) and 0.01uF for C. Then solve the remaining equations. R1 should be at least 5*R but should be close to 5*R. F0 = 1/(2πRC) R1 > 5R R2 = R3 = R C1 = C2 = C Setting the Output Type: The output can be set to either the signal after the band-pass filter (AC) or the signal after the AC-DC Filter (DC). The output is set using the solder jumper on the bottom of the board. The AC output may be useful if you want to look at the filter response on an oscilloscope. The DC output is useful if you want to drive a voltage controlled display or sample the data with a microcontroller. Setting the AC–DC Filter: The AC-DC filter response can be changed by adjusting the value of R6, R7 and C4. R6 sets the charging characteristic and R7 sets the discharging characteristic. Vc = Vac pk(1 – e^(-t/((R6||R7)*C4))) It is usually easiest to just test different values until the desired level of filtering is reached. Example values of R6, R7 and C4 (680Ω, 10kΩ, 47uF Respectively) have been provided and give reasonably good results if used to drive a voltage controlled display. Adjusting the Output Gain: The output of the AC-DC filter is passed through a gain stage that can be set between 1V/V to 101V/V by adjusting the trimmer resistor labeled “Output Gain” Moon Jellyfish Frequency Analyzer and Display Driver Narkidae.com Revised May 2015 9 Application Information: Example Voltage Controlled Display: A voltage controlled display can be created such as the one on the left. It consists of several cascaded sets of LEDs, transistor, diode and resistors, with each set feeding a signal to the next. Each set shares common supply rails making construction simple. As the signal voltage rises, it is able to pass through more diodes and turn on more transistors which sink the current for LEDs. The ground of this circuit would be connected to PWM_OUT in order to control the brightness of the whole display. Controlling the Display Brightness: A voltage controlled display can be implemented such that it’s brightness can be controlled by the Moon Jellyfish. If the display positive supply pin is connected to the VCC pin on the small screw terminal and the display negative supply pin is connected to the PWM_OUT pin, the display can be pulsed on and off by pulsing the PWM_IN pin. By adjusting the duty cycle, the brightness can be controlled between fully off (0% duty cycle) to fully on (100% duty cycle). Moon Jellyfish Frequency Analyzer and Display Driver Revised May 2015 10 Schematic: Narkidae.com