Discrete FET Guitar Preamp
No description available.
Guitar Effect Bypass Circuit
Observing my Boss pedals and how they were switched on and off I figured there must be more to it. It took me only about 4 hours to design and test this circuit. It works very well and I’m really...
FET biasing
Unlike BJTs, thermal runaway does not occur with FETs. However, the significant differences in maximum and minimum transfer characteristics make ID levels unpredictable with a simple fixed-gate bias voltage. To achieve reasonable limits on quiescent drain currents (ID) and drain-source...
Guitar Tone Control
This preamplifier was designed as a stand-alone portable unit, useful to control the signals generated by guitar pick-ups, particularly the contact "bug" types applied to acoustic instruments. Obviously it can be used with any type of instrument and pick-up. It...
Preamp Stage For Ceramic Phono Cartridge Or Violin Pickups
Although several variations of a standard RIAA preamplifier for magnetic phono cartridges have been published, there has not yet been a preamp stage designed specifically for ceramic cartridges.
The RIAA preamplifier is an essential component in the audio signal chain, particularly...
fADC Amplifier Circuit Simulations
A bandwidth-limited amplifier shapes the waveform sampled by the 40 MHz high-speed pipeline Analog to Digital Converter (fast ADC, or fADC). It is well known that the shaping time is twice the time constant (peaking time) for each pole of...
Radio Amplifiers Circuits
This is a 1 watt FM amplifier with a robust design that can be used to amplify an RF signal in the 88 to 108 MHz band. It is highly sensitive when utilizing quality RF power amplifier transistors, trimmers, and...
12AX7/12BH7 Hammond Tube Preamp Project
Construct a preamplifier intended to accept a 1/4" keyboard line-level signal and drive a Leslie 147 amplifier. The preamp will utilize a 12AX7 and 12BH7, following the design of a Hammond Organ preamp. The focus will be on the section...
Interesting Wiring Schematic
The pickups are connected to individual volume controls that feature push/pull functionality for coil tapping. They are routed to a 5-way switch before reaching the output jack. Additionally, a switch is desired to control the bridge pickup's activation when the...
Tube for a shunt voltage regulator
Use one FET, one Zener diode, and one resistor. The FET and resistor are unnecessary if the current is within the specifications for the Zener diode. Alternatively, a P-channel device may be used.
The described circuit configuration includes a Field Effect...