AUDIO CIRCUITS / CIRCUITOS DE AUDIO
- Active CW Filter and Audio Amplifier
- Dynamic Noise Filter
- Microphone Preamplifier Electret
- Microphone Speech Processor
- Microphone Amplifier Low/High Impedance
- Class-A Headphone Amplifier
- Class-A Audio Amplifier
- Speech Processor - TL081
- Variable CW Bandpass Filter
- Variable CW Filter and Amplifier
- Baxandall Audio Filter
- Microphone Amplifier with ALC
- Audio Amplifier with mute control
- Noise Canceling Electret Microphones - WB9YBM
- Dynamic Microphone Preamplifier
- Speech Processor - All BJT
- Audio Preamplifier with Dynamic Noise Reduction
- Class-A HIFI Headphone Amplifier
- Super Class-A Low Distortion 3W Amplifier
- CW Audio Filter with Digital Selection - PY2MG
- Microphone Preamplifier with Tone Control - PY2MG
- Boosting Gain and Limiter of LM386 - VK3AWC
- Variable Audio LPF with MAX293
- 300 Hz - 3 kHz Microphone Filter
- VOX Circuit
- Voice Level Meter
- Microphone Dynamic Compressor
- 1kHz Sine Wave Oscillator
- High-Pass Low-Pass Microphone Preamplifier - N2MNN
- Passive Audio SSB-CW Filters - W3TS
- LC CW Band Pass Filters - DC8NR
- Audio Intelligibility Enhancer - N4GG
- Dual-Tone Audio Generator - VE3FIT
- RF Speech Clipper - DF4ZS
- 1W Audio Amplifier with Compressor
- Booster for Elektret Microphone
- 74dB Gain with LM386 - JF1OZL
- Active Audio BPF 1kHz Bandwidth
- Audio Squelch Circuit
- High Dynamic Range Audio Compressor
- Low Distortion CW Filter
- SSB Audio Filter
- Active Noise Canceling Headphones
- Fourth-order Elliptic SSB LPF
- Switched-Cap Variable Audio LPF
- Voice 5 Band Equalizer
- CW Filter - DL7HG
- 1W Audio Power Amplifier with LPF
- Audio Limiter - DJ4BG
- Ge-BJT Audio Power Amplifier
- One BJT Audio Low Pass Filter
- Simple Audio Sinusoidal Generator
- 3.5W Audio PA with Active CW Filter - W1FB
- Simple FET Audio Filter
- Variable Audio Notch Filter - K4VIZ
- Voice Compressor with Filter
- Dynamic Noise Limiter
- Mike Preamplifier with Dynamic Compressor
- 40dB Audio Notch Filter
- Microphone Equalizer and Dynamic Compressor - DL7MAJ
- Audio T-Notch Filter - G3VFP
- Microphone Frequency Booster - G3VFP
- Pseudo Stereo CW - G3VFP
- Tone Meter - W1GHZ
- Subaudible Tone Encoder - W4NFR
- Dynamic Mike Preamplifier for IC-706 - W5RK
- Magical Audio Filter - W6QIF
- Noise Limiter - K8MKB
- Pseudo CW Filter
- Microphone Preamp Compressor - VE3GSP
- CW Regenerator/Processor - W6GXN
- Speech Processor with ALC - K9EUI
- Headphone MOSFET Amplifier
- Low Noise Compressor Clipper - VE3GSP
- Masher Speech Processor
- Single-Stage Push-Pull Audio Power Amplifier
- 50dB Dynamic Range Compressor
- Differential Low-Noise Mike Amplifier
- Speech Expander - VE1BZJ
- Speech Processor - W0YBF
- 3.5W Low Distortion Audio Power Amplifier
- Speech Processor for Electret Mike