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- LCD Adapter • Interface
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- SDRSharp and a DVB-T stick : a 20 EUR Spectrum Analyser ?
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- Arduino Projects 🛸
- Spectrum Analyzer • Measurement Receiver ➜
- A DC-199 MHz Spectrum Analyser 'VISIONARY' with Si4432
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- Levelmod - A DC to Daylight Microwave Powermeter
- Micro Smart Power Sensor - with AD8319, TMP101
- Polarmod - An I-Q-Processor with the AD9958
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- Kumod - 1 MHz ... 200 MHz Synthesiser with the AD9958
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- Macromod - A 850 MHz Synthesizer with the LMK61E2
- Ningmod - A RF Synthesizer with the AD9953 + co-workers
- Sathanimod - an FM Radiostation with the Si4713
- Supermod - A 23.5 - 6000 MHz Synthesizer with the MAX2871
- Teramod - A 2 to 15 GHz Synthesizer
- Ultramod - A 9.9 - 3200 MHz Synthesizer with the Si564
- Power Supplies • Voltage Standards ➜
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- Other Shields for Arduino ➜
- Shield BHUMI : A Voltage Standard, programmeable
- CALC-DUINO, a simple Pocket Calculator Shield (MAX7219)
- CLOCK-DUINO, a clock, to be shown to my teachers :-)
- DCF-77 Synthesizer. With Arduino. Aka "TimeDuino"
- Shield LEO : SMS on Power down
- Shield NRVD : Dual UHF Power Meter
- Shield MARCELLA : Control your Laboratory Devices
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- Spectrum Analyzer • Measurement Receiver ➜
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- Power Supplies ⚡
- Calculations • Design • Design Examples
- Measurements • Characterisation (Noise, Ripple)
- Anything Supplymod (mostly using Arduino Nano Every)
- Anything PETH (no Microprofessor)
- PETH-6 Power Supply • ± 15 V, 100 mA
- PETH-6 Power Supply • +7.5 V, for Arduino / Genuino
- PETH-20 Power Supply • ± 15 V, 600 mA
- PETH-30 Power Supply
- PETH-40 B3 Power Supply ±15V, 1200 mA
- PETH-40-HAM Power Supply • ± 15 V, 1.5 A
- PETH-49 Power Supply • 1 ... 19 V, 2 A
- PETH-200V - High Voltage Power Supply
- PETH-581 Power Supply • Buck Conv. with Linear Afterburner
- PETH-1074 Power Supply • Step-Down with an LT1074
- PETH-8093 Power Supply • Step-Down and linear regulation
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- Anything High Voltage
- Anything else
- AC Power Source. 310 V, 2 A with an Arduino Nano Every, SCPI
- Amplifiers • Calculations
- Audio Amplifier ➜
- Amplifier Calculations • Design ➜
- Low Noise Amplifier ➜
- Measurement Amplifier ➜
- Universal Amplifier, using Mini Circuits Components ➜
- SOT-115 J-9 Power Modules ➜
- VHF/UHF Power Amplifier with the BGD 804 - 860 MHz, 24 V
- VHF/UHF Power Amplifier with the BGY 588N - 550 MHz, 24 V
- VHF/UHF Power Amplifier with the QPA 3314 - 1794 MHz, 24 V
- VHF/UHF Power Amplifier with the QPA 3316 - 1794 MHz, 24 V
- VHF/UHF Power Amplifier with the TAT 8888 - 1000 MHz, 24 V
- VHF/UHF Power Amplifier with the RFPD 3580 - 1218 MHz, 24 V
- Even Bigger Power Modules ➜
- Shortwave Amplifier ➜
- Opamp Circuits • Knowledge
- Cascading OPAMPs For Increased Bandwidth
- Cascading OPAMPs For Zero Offset AND High Power
- Maximize Bandwidth for cascaded Opamps
- Slew-Rate Considerations
- Maximum Output Voltage vs. Frequency
- Choosing the right OPAMP to drive an ADC (SAR ADC)
- Bipolar Voltage to Unipolar Voltage ADC Driver
- Unipolar Voltage to Bipolar Voltage DAC Circuit
- Differential Amplifier
- Inverting Amplifier
- Inverting Comparator with Hysteresis • Schmitt-Trigger
- Non-Inverting Amplifier
- Non-Inverting Comparator with Hysteresis • Schmitt-Trigger
- Summing Amplifier
- Remembering Robert A. Pease, aka "RAP"
- Antenna Designer 📡
- Antenna Selection Guide
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- Dipoles ➜
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- Wokatenna Design
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- Crystal Filter Design #0 : Buy a lot of crystals :-)
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- Crystal Filter Design #3 : Verifying the results
- Helical Bandpass Filter Designer
- Interdigital Bandpass Filter
- Highpass Filters
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- PLL, VCO, DDS, Oscillators
- ADF 4350 Module
- A 100 MHz Reference Frequency Source, locked to 10 MHz
- A 100 MHz Reference Frequency Add-On, DIL-28 Formfactor
- A 100 MHz Reference Frequency with 10 MHz OCXO
- A universal VCO Board - MC100EL1648DG and PGA-103+
- A universal XCO/PLL Board - NB3N501/502/511
- Injection Lock Oscillator with PLL (and a NB3N502)
- MEMS Oscillators - SiT8008/SiT8208/SiT8209
- The Mobile Emitter
- DDS Synthesizer - with AD9851, ≈70 MHz
- Low Noise DDS Daughterboard - with AD9859, ≈ 160 MHz
- RF Reference Source - for Powermeter Calibration
- 4046 VCO Calculator
- Mini Synthesizer with 74HCT9046A
- PLL Loopfilter Designer, 2nd and 3rd order
- PLL Divider Calculator
- NE 555 Oscillator - Single Frequency
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- Wien Bridge Oscillator
- XCO3 - A low cost Crystal Oscillator Module
- Circuit Collection : Oscillators
- Mixer • Freq. Converters
- How to measure Mixer Characteristics
- A Mixer Tinkerboard for those ADE-xxx from MCL
- A Mixer Tinkerboard with the venerable NE/SA 612
- Universal Frequency Converter with the Si564
- A broadband Phase-Shifter for IQ Mixing Applications (ECL)
- An RF Phase-Shifter for IQ Mixing Applications (LVC)
- Transmod, shifts 6.8±1 GHz to 1.0±1 GHz.
- UpConverter for SDR, Callisto e.a.
- Noisy Things
- Noise • Introduction
- Calibrate your Noise Source. ENR calculator.
- Cascaded Noise Figure Calculations
- DIY Noise Source with the BFR92
- DIY Noise Source with 2 x GVA and 2 x PAT - ENR : 12.0 dB
- DIY Noise Source with 2 x GVA-81+ - ENR : 21.43 dB @ 1.0 GHz
- DIY Noise Source with 3 x GVA-81+ - ENR : 24.44 dB @ 1.0 GHz
- DIY Noise Source aka Ghettoblaster 555
- EMI Powerline Schnüffelstück
- How to Measure the Noise Floor of Your Spectrum Analyzer
- Magnetic Field Probe up to 3 GHz
- Noise Figure Measurement using the Gain-Method
- Noise Figure Measurement using the Y-Method
- Quantumoptics Stuff 3599
- QO Basics - Photodiode Things ➜
- Photodiodes for Physicists
- Photodiodes for Engineers, Technicians, ...
- Photodiodes Troubleshooting : The Mobile Emitter
- Photodiode Opamp Amplifier • Transimpedance Amplifier
- LED's ... working like Photodiodes
- LED powered Photon Amplifier
- Diodemod : for DC Characterization of Photodiodes
- Photomod : a Gain / Phase Analyzer for Photodiode Amplifiers
- QO Toolbox - Radio Frequency Things ➜
- Bias - Tee
- Bias - Tee, Broadband and Commercial
- Coupled Resonator L-C Bandpass
- DC-Block
- Diode RF Detector
- Equalizer • Slope - Compensator
- Logarithmic Amplifier with the AD8307
- Highpass, 9-pole, L-C
- Lowpass, 9-pole, L-C
- Lowpass, Highpass using Würth Power Inductors
- Magnetic Field Probe up to 3 GHz
- Prescaler :2 :4 :8 :10 :20 :40 :80 MC12093 MC12095 MC12080
- 6.5 GHz Prescaler :1 - :17 with the HMC705LP4
- 8 GHz Prescaler :80 - :640 with the HMC434 + MC12080
- Resistive Power Split, DC - 3000 MHz, 9.5 dB, 3 Way
- Wheatstone Bridge Power Split, 1 - 1000 MHz, 6 dB, 2 Way
- RF Limiter
- RF Switch - with the JSW2-63DR
- RF Switch - with the PE4250
- QO Toolbox - Audio Frequency Things ➜
- Booster (Amplifier) for Red Pitaya e.a.
- Ground-Breaker
- Quantum Computer Arithmetic Unit : Adder
- Quantum Computer Arithmetic Unit : Amplifier
- Quantum Computer Arithmetic Unit : Divider
- Quantum Computer Arithmetic Unit : Inverter
- Quantum Computer Arithmetic Unit : Multiplexer (Switch) 2:1
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- QO Setup - EMC Things ➜
- QO Basics - Photodiode Things ➜
- Components • Networks 🧲
- Resistors, NTCs
- Capacitors
- Inductors, Transformers
- Directional Couplers
- Bi Directional Coupler or Dual Directional Coupler ???
- A Bi Directional Coupler, 1 - 800 MHz, 20 dB
- A Dual Directional Coupler, 5 - 1500 MHz, 10 / 20 dB
- A Dual Directional Coupler, 5 - 2850 MHz, 17 ±1 dB
- Understanding Directivity
- How to Measure Directivity of Directional Couplers
- Gain - Phase - Adapter using the AD 8302
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7. July 2026
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ShortwaveAmplifier2N2219Ax2.php 5337 Bytes 04-03-2025 19:13:27
A Shortwave Amplifier with 2 x 2N2219A
0.1 - 50 MHz, 22 dB, 20 dBm
✈ Design Notes
This Amplifier is suiteable for a Loop Antenna, hunting for EMI-Jammers in the Lab. It is powered
by a battery, but with small changes (C11), Phantom Bias is also possible. The first stage is in an
base configuration, offering a constant low impedance and amplifying voltage. The second stage is
in an emitter configuration, offering high gain.
✈ Specifications
| GAIN | 22 dB |
| FREQUENCY RANGE | 100 kHz ... 50 MHz |
| SUPPLY | 12 V, 70 mA |
| 1 dB COMPRESSION | + 20 dBm, measured at 21.4 MHz |
✈ Downloads
✈ Frequency Response, Power was - 10 dBm
✈ 1 dB Compression, measured at 21.4 MHz
✈ Share your thoughts
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t1 = 7299 d
t2 = 7870 ms |
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