# Questions tagged [multiplier]

Voltage multipliers - circuits that transform AC supply voltage into a whole number multiple of DC output voltage.

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### How can I choose suitable capacitors for a voltage multiplier?

I would like to use voltage multiplier sextupler the input voltage 1V and frequency 4 Hz and the load is a supercapacitor 11.5 mf. What's the most suitable values of capacitors that I should choose? ...
50 views

### Analog multiplier using log and antilog amplifier

What should I add here to make it work? The output should be 3 * 5 = 15V.
72 views

### Impedance of a Dickson Multiplier

Can someone help me in regards to calculating the impedance of a Dickson multiplier? It consists of capacitors of 3.3 pF and 2850 shottky diodes. They can be assumed ideal. It consists of 7 stages, ...
13 views

### How to implement a multiple precision integer multiplier using digital circuits?

Many cores and GPU can do multiple-precision multiply for example: one 16 bit multiplier = two 8 bit multiplier = four 4 bit multiplier. I have implement such a multiplier by manipulating the partial ...
56 views

### 1-10Hz frequency count translated to PWM for stepper motor RPM

I would like to control the speed of a stepper motor based on an input signal that consists of short 12V pulses at a varying frequency of 1-10Hz. I know this is an easy task with a microcontroller but ...
102 views

### Why does my diode log amplifier in LTspice not match theory?

I am trying to learn about analog multipliers, and I'm trying to implement one using a log-antilog design. I am currently having some difficulties with the log part because simulating an ideal ...
68 views

### Cockcroft voltage multiplier - Stages not building up voltage

We are trying to develop a Cockcroft voltage multiplier that is getting input from IC555 astable driver circuit. The circuit diagram for driver and multiplier is as shown below. The final objective ...
44 views

### Hardware Multiplication ALU

I have multiplicand 5 , multiplier 7 which they are binary representation : 5 = 0101 , 7 = 0111 (4-bit) Register A to save the data to be multiplied(Multiplicand). Register B to save the multiplier ...
122 views

### Current sense resistor for high voltage

I have a 5KV DC output from a Cockcroft-Walton multiplier. The current is around few microamps as per the simulation. To prevent discharge, the 200Mohm resistor holds the voltage of the Cockcroft-...
77 views

### Cockcroft walton multiplier output both AC and DC?

I was watching this video https://www.youtube.com/watch?v=ep3D_LC2UzU and I noticed that closer to the end he is probing the upper half of the circuit and the scope is displaying square waves , also ...
50 views

### Cockcroft-Walton Multiplier strange voltage values

I am building a circuit that allows me to generate high DC voltages that can be used in conjunction with a 3He counter tube to detect slow neutron radiation. The circuit was designed by someone else ...
83 views

### Multiplying oscillator signal with a pulse

I am trying to multiply my oscillator sine signal with my pulse. But, the voltage of the oscillator is too big so it saturates. This is the output I am getting from my oscillator. I am getting the ...
31 views

### Shift left followed by round for performing: y=x+cz in hardware

I wan't to implement a simple arithmetic, given the following (say 8 bits) integers x,y,z $$y = x + c z$$ where 'c' is a fraction of a power of 2: 2^-1, 2^-2, 2^-3,... I was adviced to perform the ...
175 views

### Flyback transformer vs neon sign transformer

I've been working on my spark gap Tesla coil, and I'm planing to use a 5kV 30mA neon sign transformer connected to a voltage multiplier circuit with 10 stages to get a higher voltage. Could I use the ...
49 views

### Calculation of max possible current load from voltage multiplier connected to PSU 12V rail [closed]

today I found in a box a PSU with two 12V rails each delivering 17A (Fortron SAGA II 400W) and decided to step-up the voltage so can feed the DPS5020-USB DC-DC converter (rated at 60V/20A max output). ...
178 views

### How to implement a 48x48 multiplier using DSP48E slices in Verilog HDL?

Is it possible to create a 24x16 multiplier using DSP48E slice from a 25x18 dedicated multiplier in Virtex-7? Please post a sample code... Are any advanced multipliers of these available?
151 views

### Voltage multiplier - selection of values

I'm designing a circuit, which includes a voltage multiplier. The schematics of voltage multiplier is well known, but it usually appears without any specific values for capacitors and diodes: My ...
167 views

### I designed and made this circuit but it produces only 360V when it should be producing at least +1000V

The circuit consists of a 9V battery (the input source) connected to a 555 astable multivibrator operating at 1.34 kHz frequency connected to a transformer and a long voltage multiplier chain. ...
162 views

### What kind of hardware multiplier do modern processors use?

I was wondering what kind of multiplier implementations modern processors use. Is it some derived variant of booth Wallace tree algorithm? Are these kinds of micro-architectural details publicized ...
75 views

### PLL (Phase Locked Loop)

I find a bit of confusion on the web about the use of the PLL. Sometimes I read that, given a certain input signal, it is used to generate a signal whose frequency is N times that od the input one, ...
2k views

### How can I make 20-200 ohm variable resistor look like a 20-240 ohm resistor?

I have a fuel sender in my kit car that goes from 20R to earth (full) to 200R (empty). Unfortunately the gauge (constant current source, measuring resistance to earth?) expects empty to be 240 ohms, ...
53 views

### Voltage multipliers work worse with more stages?

I'm simulating voltage multipliers (Dickson topology) with the stages from 1 to 12, following the paper "Design Optimization and Implementation for RF Energy Harvesting Circuits, 2012". The load was ...
181 views

### Confused with voltage doubler circuit

This is how the book explains the process: Let me consider the first 90° of the input, the capacitor charges up to the peak voltage less the diode drop of D1, D1 is forward biased and D2 is reverse ...
76 views

### How to control charge on a high-voltage capacitor after voltage multiplier?

Can anyone think of an electronic way to control the charge on a high-voltage capacitor that is fed by a multi-stage voltage multiplier? I can control the charge on the way up by controlling the ...
88 views

### Problem in blocking and non-blocking - verilog

I have this code and I am having a problem in the product output, any ideas? I've tried a lot and it doesn't work.
435 views

### issue with booth multiplier VHDL code

I'm trying to build a 4-bit booth multiplier using VHDL. I don't know why but the process block is executed just once. The state does change from idle to busy then it doesn't work. ...
87 views

### Can you get values of the components in the circuit?

I have a mosquito repellent circuit diagram (voltage doubler) with printed values. Can anybody find the actual component value of the capacitors?
931 views

### Gilbert cell. Understanding the basic

I am trying to understand a concept of Gilbert cell. I have the next figure. Quastion1: If +1V is set up in (3), then in (4) is admitted -1V, and for (5) is -1V, (5) +1V. The current source is sume ...
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### C-W Multiplier Unipolar Input

I was seeing some circuits for a Cockroft-Walton multiplier.Most of them seem to be using an AC input voltage.My specific query is ,would this multiplier work with a uni-polar (pulsed DC) input. For ...
2k views

### 4-bit binary multiplier circuit

I have made this 4-bit binary multiplier circuit, but the product of, for example: B3B2B1B0 (1100) x A3A2A1A0 (0001) = P7P6P5P4P3P2P1P0 (00101000) and not 1100, What have I done wrong?
277 views

### How is the signal Multiplied with the Carrier in AM

In wireless transmission, via Amplitude modulation, we multiply the message signal by a carrier wave to get the modulated signal $$x(t) = m(t) \times cos(\omega t)$$ Where $m(t)$ is the original ...
700 views

### Resistance Multiplier

The circuit below is a resistance multiplier but I am having trouble deriving the effective input resistance, which should be a multiple of $R_b$. The answer should be something like R_{\text{in}}...
346 views

### Bug zapper project with counter

I have this evil thought that building a fly zapper with a counter every time it works. There are two ways in my mind, first one is hacking a bug zapper product which I already have (hand grip style, ...
613 views

### Analog analog multiplication, part of a hybrid CPU (for fun)

Short version: How do I make an analog multiplier that takes two analog DC inputs? Long version: I made a comment recommending Ben Eaters videos for another question, while doing so I ended up ...
68 views

### Help with frequency multiplying

I'm generating a 15MHz sinusoidal signal from a Colpitt oscillator that i want to multiply to 90MHz. I'm thinking about doing a triple multiplier and a double multiplier to get the right frequency. ...
119 views

### does frequency multiplier work with signal that contain multiple frequency components?

for example, say we have a wide band frequency multiplier that takes the input of 100MHz-200MHz and the output have frequency of 300MHz-600MHz（a frequency tripler). if the signal contains a 110MHz ...
810 views

### VHDL 4-bit Shift-and-Add Multiplier Buffer and Out port error

I am working on a creating a 4-bit Shift-and-Add Multiplier. I am getting this warning message - "WARNING:HDLParsers:3555 - "//filer1.egr.msu.edu/samarar1/ece230/Project05/Project05.vhd" Line 220. ...
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### Mosfet based ripple filter for tube amp

I need some hint to fully understand how this circuit works (credits to Audio Design Guide): simulate this circuit – Schematic created using CircuitLab My doubts are in the operation of the ...
407 views

### Are there any drawbacks to this oscillator frequency multiplier circuit?

I'm trying to make an upconverter from 65 MHz to UHF band using a mixer; I therefore need an oscillator frequency around 375 MHz to mix with the 65 MHz base signal. I'm also trying to vary the ...
492 views

### How to create discrete high voltage oscillator?

I need to increase 24 V DC to 1.5 kV DC. Using a voltage multiplier would require over 60 stages. I am considering using a few stages of a voltage multiplier, say 8, to increase the voltage to about ...
117 views

### Power IR2110 from a low voltage AC Source

I am trying to power the IR2110 using an AC Source. However, this source is also connected to a full wave bridge rectifier that's going to supply a controlled buck converter. I tried using a voltage ...
79 views

### In a voltage multiplier, must the frequency be low enough to allow for charging in first stage before switching?

For example, in a four stage multiplier, taking 150 V to 300 V, 450 V, and 600 V... Is it common to charge the first stage capacitor to maybe 50 V (given a high switching frequency) and propagating ...
101 views

### Do we have binary dividers cicuit on cisc computer? [duplicate]

Just like we have binary multipler circuit in cisc computer so do we have binary divider circuit in cisc computer? Or it is just like we use algothrims instead of having a real divider circuit? (Just ...
333 views

### Do we have binary dividers circuit in CISC computers? [closed]

Just like we have binary multipler circuit in cisc computer so do we have binary divider circuit in cisc computer? Or it is just like we use subtractor multiple time instead of having a real divider ...
169 views

### Voltage multiplier

please be patient as I am not a electrician/electronic engineer. I am wanting to make a negative ion generator to attempt to make a powder coating gun, I know they are cheap but I like to build for ...
367 views

### Order capacitors by leakage rate in Cockcroft-Walton voltage multiplier

Looking at a system like the Cockcroft-Walton multiplier posted here: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-3/voltage-multipliers/ To use 400V 100uF electrolytic capacitors ...
58 views

### How to derive this formula from this schematic?

This is the voltage multiplier from the paper ,it said the rectiﬁed output voltage is given by $V_{out_i}$= $V_{out_{i-1}}$ +$2(V_A-V_{ON})$,$V_A$ is the AC voltage amplitude at the input;\\$...
1k views

### Voltage Multiplier Frequency and Waveform

Note: I am aware of this question. It is 6 years old and I didn't find an answer there and I didn't want to necro the question. As part of a school physics project I need a very large voltage. I will ...