Audio equalizer with transistors BF245 - BC109
#transistor
#BF245
#BC109
#equalizer
#audio processing
#signal processing
#stereo
#sound adjustment
#low noise
#DIY audio
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3 Band Audio Equalizer Circuit
This three-band equalizer circuit is an active filter network designed for bass, midrange, and high audio frequencies. It utilizes the LM833 operational amplifier from National Semiconductors. The output of this three-way graphic equalizer is intended to be DC coupled; however,...
Free-Electron Pump (FEP) Experiments
A simple two-transistor inverter circuit has been constructed for this experiment. The transformer depicted is the inverter transformer. The output voltage from the inverter is in the form of pulses, with an estimated peak value of approximately 700V. When a...
Multi-Zone Transistor-Based Intruder Alarm
This is a simple transistor-based burglar alarm circuit. Its features include automatic exit and entry delays, along with a timed bell cut-off and reset. It is designed to be used with standard types of normally-closed input devices such as magnetic...
Single transistor audio mixer
Numerous audio mixer circuits have been published; however, this particular design is among the simplest. This straightforward audio mixer circuit utilizes only a single transistor. The base-emitter junction of the transistor is biased with diodes D1 and D2. The signals...
Tickler oscillator circuit
When the circuit is initially powered, neither transistor is activated, resulting in high base voltages for both and a tendency to turn on. Due to slight asymmetries, one transistor will activate first, leading the circuit into one of its states...
Leaky Transistor Buffer
The wah pedal operates before the amplifier but produces a low volume and a scratchy sound when the pedal is rocked back and forth. It functions correctly without the buffer. When placed in front of a Fuzz Face, no sound...
hi fi stereo multiplexer for fm
A left and right audio source is first pre-emphasized using a high-pass filter and then fed into adder circuits. The output of one adder is the sum of the two signals, resulting in the L + R signal (the monaural...
Transistor Clock
If you have been following on Twitter, you might have seen a tweet about a "Transistor Clock" kit that allows for the construction of a wall clock using 194 discrete transistors and numerous other components. This kit has been purchased,...
darklight sensor using transistor
An automatic dark detector senses darkness. As the light level decreases and the light-dependent resistor (LDR) reaches the maximum threshold resistance, the circuit automatically activates the LED D1. Conversely, a light detector senses light, and when the light level increases...