DIY Guitar Transistor Preamp

DIY Guitar Transistor Preamp
Here the circuit design for DIY guitar transistor preamp. It consists of a circuit of two transistors and four controls that can be vary the level of the treble, bass, gain, and total salidad circuit (volume). It can be used as buffer at the beginning of a chain of effects. Or combine it with the Marshal Guvernor and a power to put together a cute amplifier. (more…)

Multidirectional microphone amplifier

Multidirectional microphone amplifier
This Multidirectional microphone amplifier circuit is often used in a panel discussion or a meeting room to capture the audio from all the partners without the need to give each microphone. Placing this in the middle of the table captures audio from each through which is formed by four electret capsules with a level control for each individual reception. (more…)

Preamplifier for magnetic phono cartridges

Preamplifier for magnetic phono cartridges
This amplifier circuit is intended to be added to the preamplifier which does not have a phono input. Such a phono input is required for normal record players with a dynamic pick-up, of which millions are still around. Moreover, the amplifier does not only bring the output of the pick-up to line level, it also adds the correction to the frequency response (according to RIAA requirements). (more…)