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Analog Multiplier Schematics / Circuits

2 Quadrant Analog Multiplier uses No Log Amps - EDN-Design Ideas:    You usually obtain  product of two values by summing  outputs of logarithmic amplifiers.  block diagram in Figure 1 shows a configuration that produces a two-quadrant product of analog signals but uses no log amplifiers. VA and VB are  multiplier inputs.  triangle generator produces a linear triangle whose voltage range is between0V and  maximum value that VB can attain (VB>=0V). VA may assume both positive and negative values. Figure 2 shows  circuit waveforms.

3 Transistor Audio Amp 50 Milliwatt - Here is a little audio amplifier similar to what you might find in a small transistor radio.

Bit shifting method performs fast integer multiplying by fractions in C - EDN-Design Ideas:  Instead of calling math-library functions, you can multiply integers using bit shifting.

Decibel Meter - The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as...

Half-flying capacitor analog multiplexer for microcontrollers - This technique uses digital  I/O pins to multiplex analog voltages into an analog input on the microcontroller. The method is most suitable for signals that do not need to be sampled frequently and it may be extended to accommodate a large number of inputs, though for a large number of inputs, the use of a separate analog multiplexer or a mincrocontroller with an integrated multiplexer would often be a better choice... 

LED Decibel Meter - The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as

LMH730151 Triple 2:1 Multiplexer Evaluation Board - National Semiconductor Application Note

LMH730276 4:1 Multiplexer Evaluation Board - National Semiconductor Application Note

LMH730277 2:1 Multiplexer Evaluation Board - National Semiconductor Application Note

Rectifier tracks positive and negative peaks - EDN-Design Ideas:  Versatile precision rectifier also delivers full-wave output.

Simple 3 Transistor Audio Amp 50 Milliwatt

Single Pulse Voltage Multiplier  - Sometimes it's necessary to generate a higher voltage pulse from logic circuits than the circuits themselves can supply. The need to generate a programming pulse for Atmel flash controllers was one of those. In that case, I needed to generate an infrequent pulse that...

Temperature controller has take back half convergence algorithm - EDN-Design Ideas:  Enhanced closed-loop control balances stability, responsiveness....

Two Quadrant Analog Multiplier uses No Log Amps - EDN-Design Ideas:    You usually obtain the product of two values by summing the outputs of logarithmic amplifiers. The block diagram in Figure 1 shows a configuration that produces a two-quadrant product of analog signals but uses no log amplifiers. VA and VB are the multiplier inputs. The triangle generator produces a linear triangle.

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