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Entegreli transistörlü çeşitli amfi şemalarını ve bazılarının pcblerini barındıran faydalı siteye aşağıdaki linkden ulaşabilirsiniz
| No. | Project | Description | PCB |
| 01 | A Better Volume Control | A volume control using a linear pot that is much better than most log pots | |
| 02 | Simple High Quality Hi-Fi Preamp | As it says - simple, high quality preamp. Has all the facilities normally expected | |
| 03 | 60W / 8 Ohm Power Amplifier | (Updated) My old faithful power amp design. - See Project 3A | PCB |
| 04 | Dual Power Supply | A power supply that is adaptable for most power amps | |
| 05 | Preamplifier Power Supply | Uses External AC Adapter. Safe and effective, low noise and no hum! (PCB replaced by P05A) | |
| 05A | Preamplifier Power Supply | All the features of the P05, but much more versatile. Includes ‘Loss of AC’ detector. | |
| 05B | Preamplifier Power Supply | All the features of the original P05A plus a complete muting circuit. | PCB |
| 06 | Phono (RIAA) Preamp | Very high quality moving magnet phono preamp - few circuits will better this one. | PCB |
| 07 | Discrete Op-Amp | Class-A Output. Intended as an experimental device - works extremely well | |
| 08 | 2-Way Electronic Crossover | Conventional 3rd order electronic crossover | |
| 09 | 24dB/Octave 2/3-Way Xover | Linkwitz-Riley alignment. This is a very nice crossover - Rev-B boards now available  |
PCB |
| 9a | A Reader’s Xover | This is well worth reading if you can’t decide on biamping | |
| 10 | 20 Watt Class-A Power amp | True Class-A power amp for low power systems or tri-amping | |
| 11 | Pink Noise Generator | For loudspeaker and room acoustics testing | |
| 12 | Current Feedback Amp | An updated version of a very old 60W / 8 Ohm design | |
| 12a | El-Cheapo | This is the real El-Cheapo, presented in more or less original form | |
| 13 | Low Noise Preamplifier | Simple unbalanced design, suitable for microphones - very low noise | |
| 14 | Power Amp Bridge Adapter | A conventional adapter for bridging power amplifiers | PCB |
| 15 | Capacitance Multiplier Supply | Extremely low ripple supply with less power dissipation than a regulator | |
| 16 | Audio Millivoltmeter | For Testing Amplifiers (etc) - An analogue design, 3mV to 30V with dB scale | |
| 17 | A-Weighting filter | For noise measurements. Ideal for use with the AC Millivoltmeter above | |
| 18 | Simple Surround Sound Decoder | A line-level version of the “Hafler matrix” decoder | |
| 19 | Single Chip 50W Power Amplifier | Using the National Semiconductor LM3876 Power IC. | PCB |
| 20 | Simplest Ever Bridge Adapter | Use this simple method, and avoid external circuits | |
| 21 | Stereo Width Controllers | 2 to choose from. Expand or contract the stereo sound stage | |
| 22 | Simple Audio Oscillator | For use with the millivoltmeter, for testing amps and speakers | |
| 23 | Power Amp Clipping Indicator | A fast and accurate indicator to show an amp is clipping | |
| 24 | Hi-Fi Headphone Amplifier | Contributed by a reader, this is a very nice circuit | |
| 25 | Phono Preamps For All | Various circuits for moving coil and moving magnet pickups | |
| 26 | Digital Delay Unit | Digital delay (Note - The delay IC no longer available) | |
| 27 | 100 Watt Guitar Amp (Mk II) | The new and improved version of the original Project 27 guitar amp (now 27b). | PCB |
| 27b | 100 Watt Guitar Amplifier | The original of the unit above. Retained for posterity, and has speaker box details | |
| 28 | Parametric / Sub-Woofer Equaliser | A simplified version, which performs surprisingly well | |
| 29 | Tremolo Unit | A versatile guitar effect. This is a simple circuit that gives very good results | |
| 30 | Stage and Recording Mixer | Able to be built in modular form, allowing as many (or few) channels as desired. | |
| 31 | Full Featured Transistor Tester | Just the thing to check the transistors for any project | |
| 32 | Car Audio Preamp + Artificial Earth | Especially for car audio installations, can be used for any single supply system | |
| 33 | Loudspeaker Protection and Muting | Protect speakers from turn-on and turn-off transients and amplifier faults | PCB |
| 34 | Guitar Spring Reverb Unit | A high performance spring reverb unit for guitar amps | |
| 35 | Direct Injection (DI) Box | An essential companion for the mixer for stage or recording work | |
| 36 | Death Of Zen (DoZ) | An ultra simple, high performance Class-A power amp. Revision-A boards now shipping | PCB |
| 37 | Death of Zen Preamp | “Minimalist” preamp, designed to suit the DoZ (or any other) power amplifier | PCB |
| 37A | Death of Zen Preamp | Updated “minimalist” preamp, designed to suit the DoZ (or any other) power amplifier  |
PCB |
| 38 | Signal Detecting Auto Power-On Unit | For equipment to be turned on with the main amp. Detects signal and applies power. | |
| 39 | Soft Start Circuit | Designed for (large) toroidal transformers, limit the inrush current to a sensible value. | PCB |
| 3A | 60-100W Hi-Fi Power Amp | 100W into 4 or 8 ohms. Has excellent performance, and is easy to build. | PCB |
| 40 | Load Sensing Auto Switch | Apply power to the system by turning on one item. Superseded by Project 79. | |
| 41 | Opamp Design + Test Board | Quickly assemble an opamp circuit for testing. Very easy and intuitive to use | |
| 42 | Thermo-Fan For Amp Cooling | Use a 12V computer fan to cool your amp. Uses diode temperature sensor | |
| 43 | Ultra Simple Split DC Supply | When you need a +/- supply, and only have a DC adapter | |
| 44 | Dual +/-25V Lab Supply | Up to 800mA (typical) output current at +/-25V. | |
| 45 | Simple Bass Guitar Compressor | An ultra simple compressor, ideally suited for bass guitar. | |
| 46 | Thermal Shutdown/ Protection | Add this circuit to either turn the amp off or activate a cooling fan if it overheats | |
| 47 | Vox AC30 Simulator | This project has been withdrawn at the author’s request | |
| 48 | Sub Woofer Processor | Designed to operate a sub-woofer driver below its resonant frequency. | |
| 49 | Guitar Vibrato Unit | A reasonably simple circuit, with results similar to the Vox AC30 guitar amp | |
| 50 | Mic Circuit Tester | Small oscillator to check mic & line circuits during sound setup | |
| 51 | Balanced Line Drivers | Use these to eliminate hum for long signal leads | |
| 52 | Distortion Analyser | A simple distortion meter you can use with an oscilloscope or millivoltmeter | |
| 53 | Output Power Limiter | Just the thing if you want to limit amplifier power to something “sensible” | |
| 54 | Low Power FM Transmitter | Useful to retransmit the hi-fi to another FM receiver nearby, or as a wireless mic | |
| 55 | PPM and VU Meter | A versatile and useful VU meter circuit, can also operate as a Peak Program Meter | |
| 56 | Variable Impedance | Modify the output impedance of an amplifier with this simple circuit | |
| 57 | SIM - The Simple Version | The smallest variation in amplifier performance is shown with this simple circuit | |
| 58 | Speaker Measurement Set | Based on work done by Siegfried Linkwitz (reproduced with his permission) | |
| 59 | Self Oscillating Amplifier | Allows you to make a power amp oscillate at a defined frequency for testing | |
| 60 | LED VU Meter | Standard LED VU meter, includes simple rectifier circuit for full wave detection |
PCB |
| 61 | 55W Hi-Fi Power Amplifier | A design from a fellow Australian. (Full details unavailable) | |
| 62 | LX-800 Lighting Controller | Light is always needed for theatre and live music, and this is just the ticket | |
| 63 | Multiple Feedback Bandpass Filter | This is the basis of an expandable equaliser and analyser or vocoder | |
| 64 | Instrument Graphic Equaliser | Designed especially as a guitar / bass equaliser, this unit is expandable | |
| 65 | Strobe Light | Designed as a companion to the LX800, can also be used by itself | |
| 66 | Low Noise Balanced Mic Preamp | A discrete front end makes this balanced microphone preamp very quiet | PCB |
| 67 | Fast Audio Peak Limiter | This peak limiter is simple and very effective. Uses discrete FET gain control | |
| 68 | 300W Subwoofer Amplifier | This amp is designed especially for subwoofers | PCB |
| 69 | Switchmode Car Power Supply | Low power +/-12V supply for car preamps and equalisers (etc) | |
| 70 | DoZ Headphone Amplifier | The DoZ is ideally suited to headphone use. Revision-A boards now shipping | PCB |
| 71 | Linkwitz Transform Circuit | The Linkwitz Transform circuit - an equaliser to provide extended bass response | PCB |
| 72 | 20W/Ch Stereo IC amplifier | Based on the versatile LM1875 from National Semiconductor | PCB |
| 73 | Hi-Fi PC Sound System | You have never heard your MP3 collection, CD or games sound so good | PCB |
| 74 | Simple RF Probe | Indispensable for any RF work. Uses just 4 passive components | |
| 75 | Constant Q Graphic Equaliser | Constant Q design. Can be made using as many or as few sections as needed. | |
| 76 | Opamp Based Power Amplifier | This is a contributed project, and has some interest as a learning exercise | |
| 77 | 13.8V Power Supply / Charger | A supply for testing and working on car amplifiers - up to about 500 Amps! | |
| 78 | 3-Way 12dB/ Octave Crossover | Contributed project, simple 12dB/ Octave crossover network. | |
| 79 | Current Sense Auto Power Switch | A current sensing switch turns on multiple devices from one master | |
| 80 | Reverse RIAA Equaliser | Test phono preamps for correct equalisation, or convert unused phono inputs. | |
| 81 | 12dB/Octave 2-Way Xover | Linkwitz-Riley alignment and phase coherent (uses the P09 Rev-B PCB) |
PCB |
| 82 | Loudspeaker Test Box | Quickly and accurately determine the optimal impedance correction network | |
| 83 | MOSFET Follower Power Amplifier | Another contributed project that may be of great interest | |
| 84 | Subwoofer Graphic Equaliser | This is a constant Q design, eight 1/3 octave bands covering 20Hz to 100Hz. | PCB |
| 85 | Simple S/PDIF DAC | Quite possibly the simplest possible S/PDIF receiver and DAC you will ever find | |
| 86 | Miniature Audio Oscillator | The Miniosc - low distortion battery powered audio oscillator | |
| 87 | Balanced Transmitter / Receiver | Updated and upmarket versions of the Project 51 balanced circuits | |
| 88 | High Quality Audio Preamp | An audiophile quality preamp, with full switching and programmable gain | PCB |
| 89 | Switchmode Power Amp Supply | A high power (350W typical) car power amplifier supply | |
| 90 | Dimmer Control Polarity changer | Convert old dimmer units using a 0 to -10V control signal | |
| 91 | 78 RPM and RIAA Phono Equaliser | Multi Standard 78 RPM and RIAA Phono Equaliser handles all “standards” | PCB |
| 92 | Guitar and Bass Sustain | A simple, low distortion limiter for musical instruments | |
| 93 | Recording and Measurement Microphone | A simple selection of projects for making your own microphones | PCB |
| 94 | Universal Preamp/ Mixer | A small and versatile mixer and preamp, suitable for many uses. | PCB |
| 94A | Universal Preamp/ Mixer | Alternative wiring for the versatile mixer/ preamp, suitable for many uses | PCB |
| 95 | Low Power -Ve Supply | Low power -ve supply for car audio preamps and crossovers | |
| 96 | 48V Phantom Supply | Low noise 48V regulator and phantom mic supply circuits. | PCB |
| 97 | Hi-Fi Preamp | Another preamp, but this one has tone controls, and all pots are PCB mounted | PCB |
| 98 | Battery Charger | Automatic Charger for Battery Operated Hi-Fi Preamps | |
| 99 | Subsonic/ Rumble Filter | A 36dB/octave 17 Hz high pass filter to remove ultra low frequencies | PCB |
| 100 | Headphone Adaptor | A simple adaptor to provide a headphone output to an existing power amplifier | |
| 101 | MOSFET Power Amp | 200W MOSFET Hi-Fi Power amplifier | PCB |
| 102 | Simple Pre-Regulator | Use this to adapt P05 to a power amp supply for your preamp | |
| 103 | Subwoofer Phase Control | A standard phase control for use with subwoofers. | |
| 104 | Preamp/ Crossover Muting Circuit | Muting circuit suitable for all line-level applications. | |
| 105 | DIY Electrostatic Loudspeaker | An ESL using ready made panels available exclusively from ESP. Part 1 | |
| 105 -2 | DIY Electrostatic Loudspeaker | ESL cabinet details. Part 2 | |
| 105 -3 | DIY Electrostatic Loudspeaker | ESL Transformers and Power Amplifier Details. Part 3 | |
| 106 | hFE Tester | An hFE tester with switched collector currents for the Device Under Test | |
| 107 | Polarity Reversal Switch | Switch the absolute polarity (180° phase shift) of signals with this simple circuit | |
| 108 | Switchmode PSU Protection | This contributed circuit can help prevent failure of your switching power supply. | |
| 109 | Portable Headphone Amp | Another contributed circuit, this is a complete portable headphone amp that features crossfeed. | |
| 110 | IR Remote Control | Volume and mute are provided by this simple but functional circuit. Suitable for all preamps. | PCB |
| 111 | PIC Speaker Protection | This doesn’t replace P33, but it is possibly the ultimate speaker protection. | |
| 112 | Dummy Head Recording Microphone | Surprise yourself with one of the most realistic recording processes known. | PCB |
| 113 | Hi-Fi Headphone Amp | Yet another headphone amplifier, but this one will have PCBs available soon. | PCB |
| 114 | PWM Power Amplifier | Based on the ColdAmp BP4078 400W module, Class-D is here. Definitely worth looking at! | PCB |
| 115 | GainClone Amplifier | Complete GainClone amplifier, including full chassis details (2 part article) | PCB |
| 116 | PWM Subwoofer Amplifier | Using a ColdAmp BP4078 module, this article has complete construction details | PCB |
| 117 | 1.5kW Power Amplifier | Just the thing for those for whom no amount of power is enough  |
|
| 118 | PC Power Switch | Simplest ever PC switching unit - turn on peripherals with the PC | |
| 119 | Signature Analyser | A component signature analyser that allows in-circuit parts tests | |
| 120 | Crowbar Speaker Protection | The final answer to speaker protection. Comes with many cautions and warnings! | |
| 121 | Reading Inductance | Use your DC voltmeter or frequency counter to measure crossover coils. | |
| 122 | Ultra-Simple Mic Preamp | A single low cost IC and tiny PCB make a great utility microphone preamp. | PCB |
| ABX | ABX Comparator | Full ABX testing unit, without microcontrollers or a PC | |
| X | A-B Switch Box | Can you really hear the difference between amps or cables? |
