External BFO DIY PCB 455 kHz Beat Frequency Oscillator SSB CW Shortwave Radio

Description

PLEASE, READ CAREFULLY!
All Information  is here!
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If you have doubts, please ask me before buy!
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This list is for
NEW electronics parts components kit, for YOUR DIY project!
External Beat Frequency Oscillator 455 kHz (BFO).
Great to user with
Shortwave Radio.
Is useful to listen SSB & CW signals!
DIY Electronics Components Kit with PCB ( printed circuit board ).
Basic Characteristics:
Adjustable range from center frequency of 455 kHz Δf +/- 20 kHz ( Coarse adjust - White Coil ).
Adjustable range from center frequency of 455 kHz using the "Fine Tune" potentiometer ( Δf +/- 1.5 kHz ).
Excellent frequency stability, less than +/- 25Hz at stable temperature room!
(
Measured with HP 5315A during the time of 2 hours! )
Output Level ( sine wave ) = 1.25Vpp under load Zout = 1k ohms ( At high Z load 2.2Vpp ) See Pictures.
Measured with Tektronix 2430A and 10x probe.
Output signal with "Buffer Insulator" improve frequency stability, due to load variation.
Operate Voltage: 9 to 22V ( Internal voltage regulator 78L06 ), minimum 6V without the regulator.
The package for this DIY kit is composed by:
1 x  PCB 2.5"x 1.5" ( Dual Side Copper BLUE )
1 x 455 kHz Oscillator Coil
2 x Transistors
1 Voltage Regulator
1 x Varactor Diode
1 x Potentiometer 10k + 1 Knob
8 x Resistors
5 x Ceramic Capacitors
2 x Electrolytic Capacitor
5 x Terminals for PCB
( Please, see the pictures for more details, with electronic schematic).
Please, download the pictures and the schematic for you!
It is easy to assembler, follow the schematic and the PCB with parts location.
No necessary instruments to do adjustment!
Only listen the beating frequency signal on the radio with IF of 455 kHz is enough!
Adjust the potentiometer at center, and do the coarse adjust at WHITE coil for the beating signal.
In some radios, do not need make wire connections, only approaching the BFO!
But, the best way to achieve good performance, is the injection inside the radio, at last IF amplifier stage ( see pictures )!
I would like suggest to you, the Crystal Frequency Marker !
It is useful to calibrate or verify the dial frequency of all shortwave receiver.
It generate harmonics frequencies to beyond 30MHz!
Please, see at Ebay Link below:
https://www.ebay.com/itm/202346150633
Please, be sure to see all my list, on the link below:
http://www.ebay.com/sch/haf_rio/m.html
Attention all Customers!
To US continenTal, shipping is via FedEx and cost .50.
To Canada, Europe, Australia and Japan, please conta me.
Please, inform your postal code to check the shipping cost!
Delivery details:
1. All item will be shipped by FedEx Economy.
2. Customs process in your country, must be considered as delay cause to delivery.
3. After you decided to bought, read and save ( download ) all pictures and information.
Please, if you do not agree with information above, do not buy!
Thank you!
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