- 2007-05-09
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دوست عزیز این هم فایل هگز به همراه سورس c :
[hide] مشاهده فایلپیوست 42160[/hide]
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This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF band.
Features
Technical specifications
- Display range: 0,0 to 999,9 MHz, resolution 0,1 MHz
- Correct rounding, reduced blinking of last digit
- Over-range indication
- Fast measurement - short measuring period
- High input sensitivity in VHF/UHF band
- Switchable intermediate frequency offset for use with receiver
Supply voltage: 8-20 V
Supply current: typ. 80 mA, max. 120 mA
Input sensitivity: max. 10 mV in 70-1000 MHz range
Measuring period: 0,082 sec.
Display refresh rate: 49 Hz
Schematic diagram
Parts list
R1 - 39 k
R2 - 1 k
R3-R6 - 2,2 k
R7-R14 - 220
C1, C5, C6 - 100 n mini
C2, C3, C4 - 1 n
C7 - 100 u
C8, C9 - 22 p
IC1 - 7805
IC2 - SAB6456 (U813BS - different pin layout, not tested, also maybe R1 value must be changed)
IC3 - PIC16F84 programmed + socket
T1 - BC546B
T2-T5 - BC556B
D1, D2 - BAT41 (BAR19)
D3 - HD-M514RD (red) or HD-M512RD (green), 4-digits multiplex driven LED display from HP, or four standard 1-digit LED displays
X1 - 4 MHz crystal
BNC input connector
The SAB6456 is a prescaler for UHF/VHF tuners. The circuit has an input frequency range of 70 MHz to 1 GHz, has high input sensitivity and good harmonic suppression. With lower sensitivity it's usable down to 3 MHz.
The circuit comprises an input amplifier, a divider stage and an output stage. The divider stage may oscillate during no-signal conditions but this oscillation is suppressed when input signals are received. The voltage-edges of the output signals are slowed internally to reduce harmonics in the television intermediate frequency band.
Printed circuit board
Important!PCB - standard pin connection of SAB6456
There are two pin connection versions of the SAB6456. In the schematic diagram there is drawn a standard pin connection as provided by Philips datasheet. The PCB is proposed for both versions.
PCB - different pin connection of SAB6456
The display is placed vertically on the PCB.
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