Audio Circuits
- FM Transmitter
- Telephone In Use Indicator
- Telephone Record Control
- 50 Watt Amplifier Circuit
- 60W Bass Amplifier Circuit
- 10W Mini Audio Amplifier Circuit
- Low pass filter - Subwoofer Circuit
- 200W audio amplifier Circuit
- 18W Audio Amplifier Circuit
- Sound Effects Generator Circuit
- 10W Audio Amplifier with Bass-boost Circuit
- The "UnFETtered Crystal Radio! Circuit
- Phono Preamplifier Circuit
- 22 Watt Audio Amplifier Circuit
- 100W RMS Amplifier Circuit
- One-IC two-tones Siren Circuit
- Low impedance microphone amplifier Circuit
- 60W Linear amplifier Circuit
- Amplified Ear Circuit
- AM Transmitter Circuit
- AM Receiver Circuit
- 4W FM Transmitter Circuit
- 60W Guitar Amplifier Circuit
- Sound Level Indicator Circuit
- Transmitter FM 45W with valve Circuit
- Precision Audio Millivoltmeter Circuit
- Amplifier Timer Circuit
- 3 Line Mixer Circuit
- FM radio (may be used with PC) Circuit
- 15W Fm-transmitter Circuit
- Amplifier of acoustic frequencies with preamplifier Circuit
- Stereo Tube Amplifier Circuit
- Three-Level Audio Power Indicator Circuit
- 3W FM Transmitter Circuit
- ZN414 Portable AM Receiver Circuit
- Digital Volume Control Circuit
- AM FM Simultaneous Transmitter Using Digital IC Circuit
- Audio Level Meter (vumeter) Circuit
- 25W Mosfet audio amplifier Circuit
- Sound Level Meter Circuit
- AM To FM converter Circuit
- FM Telephone Bug Circuit
- FM Transmitter Circuit
- FM Transmitter Bug Circuit
- 2 Transistor FM Voice Transmitter Circuit
- Electronic Siren Circuit