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Circuit diagram 75 Meter QRP SSB Transceiver

The 75 Meter QRP SSB Transceiver Theory of Operation 6-30-03 In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is […]

How to read Resistor Color Codes?

How to read Resistor Color Codes? Here CODE COLOR RESISTOR for Resistor color coding scheme and calculator in JavaScript. resistor color code Calculate Resistor Values from Color Codes. Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, White. Black, Brown, Red, Orange, Yellow, Green How to read Resistor Color Codes? Here CODE COLOR RESISTOR for […]

Filter for Headphone AMP schema

3KHz Low Pass Filter for Headphone AMP schema using LM368, MF6-50 Headphone Amplifier Schematic I built a portable headphone amplifier for testing purposes. Each channel uses a single Burr-Brown LM368, MF6-50 opamp in inverting configuration. It has adequate current capability to drive most headphones without an output stage. I have used it with Sennheiser 465s […]

1tr preamp mic schematic

1tr preamp mic schematic using c828 R1 …… 10K R2 …… 220K R3 …… 5K6 R4 …… 560K VR …… 10K C1 …… 100nF C2 …… 47uF Q ……. C828

More circuit headphone amplifier

More circuit headphone amplifier using IRF610

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