Diy attenuator switch driver

It seems to have a constant 8ohm load on the input. But later on, i decided to give a try to build myself. For amps under 30 watts you can use a cheaper 50w lpad, for amps up to about 60 watts, use the 100w as above. A serialtype attenuator figure 1 can be used as a direct substitute for a common potentiometer. Notice that the 4 pole double throw 4pdt switch takes care of both the grounds and the hot leads so that when one source is selected, the control is neatly inserted into the circuit without any ground sharing. An attenuator is an electronic device that reduces the power of a signal without appreciably distorting its waveform. Petrol gas switch for a pajero car reversing horn with flasher bicycle speedometer with hub dynamo rear fog lamp for vintage cars central locking interface automatic windshield washer control simple headlight reminders led bike light fog lamp switch fog lamp sensor flashingled batterystatus indicator motor bike headlight controller carbulb. Agilent 8490458m programmable step attenuators for microwave. The solenoids automatically disconnect after switching, which minimizes the attenuators power requirements and simplifies the driver circuit design. I noted that the shallco is not ladder shunt, like the goldpoint is. It is specially suited to reducing the level of a highoutput microphone to prevent it from overloading the microphone input of a mixer or recorder in applications with high sound pressure levels. This design is a combination of two diy pagesthis site is the basis for my attenuator. Keysight 117bc attenuatorswitch drivers operating and service manual 1 introduction. Nov 04, 2019 the attenuator portion is copied from a article, so it should be sound.

Step attenuator kit ernest neijenhuis pa3hcm homepage. Hp agilent keysight 117a attenuator switch driver, fully tested, guaranteed. To control the relays one can create hardwired logic. This section includes all available accessories for the aeroflex weinschel programmable attenuators such as our model 8210aattenuator switch controller, product specific driver boards, and our programmable attenuators with our builtin microprocessorbased drivers. The 4 ohm version would use a stereo 8 ohm lpad with the terminals wired in parallel, my havanatone and coppertone attenutors use this design. Good audio attenuator rotary switches are made for instance by dact.

This is an 8 ohm attenuator built using an 8 ohm lpad. Diy audio projects doityourself hifi for audiophiles. This website provides schematics and documention, targetting diy audio. Complete list of electronics projects circuit diagram. Here is a shot of the interior of the unit prior to base installation. Digital step attenuators offer precision and linearity. The 117b is fully backward compatible with the 117a in terms of functionality and. The switched attenuator comes fully assembled and uses 1% precision metal film resistors on a make before break 2pole stereo 24position switch. The first half of the first switch, at the input of the attenuator transmitter side, has two 107 ohm resistors paralleled to give one watt protection in the event that the attenuator is overloaded. The second half of this first switch is wired with a single 53.

A power attenuator is the easiest and most valuable doityourself diy project for a tubeamp user. The keysight 117c can also be used to independently control up to 20 switches. Dummy load and power attenuator projects the best diy project. Keysight 117bc attenuator switch drivers operating and service manual 1 introduction. Agilent technologies 117a attenuatorswitch driver operating and service manual part number. These lpad attenuators are linear which means that if you use it with 10w amp you get 5w output with lpad set to 50%.

The fold switch can set the folding threshold to hi or lo or it can turn the folding stage off in the no position. The keysight 117b can also be used to independently control up to 10 switches. It uses a big rotary switch to select discrete resistor pairs usually corresponding to a few db change in volume per step. Find hp 117a gpib compatible attenuator switch driver, surplus store at ventura california 888 4886550 call toll free. If the controller itself is switched off, it will remember its last settings volume and. Highquality stepped attenuators for less audio diy. The drive switch can set the overdrive character to soft or hard or something in between. August 1999 dact ct 1 audio attenuator diy delights. It consists of a chain of resistors connected in series. Dale 23 step attenuator volume pot mono potentiometer 100k ladder type.

The attenuator portion is copied from a article, so it should be sound. This approach considers the delays contributed by the logic driver circuitry that is usually operating with ttl or cmos control signals. The remaining three switches are all wired identical. Using the visc and standard rf components, you can easily create custom rf switch matrixes and control them with simple, intuitive ethernet commands that match your custom switch topology. A fully balanced shallco switch, even with prp resisitors will cost you a bit of money plus time soldering. May 23, 2014 hp agilent 117a attenuator switch driver laboratory sunrisesurplusinc.

This allows the attenuator to be switched completely out of circuit, so you could install one permanently on the inside of a. Amb laboratories diy audio forums view topic attenuator. Each switch allows you to include or bypass the corresponding. The problem is the resistor noise is added up, the more that are in the way of the signal. The insides of the unit are almost as tidy as the outside. I have gain controls on 12 channels, but on the remaining 4 chanels i have no gain control at all. Because heavy attenuation can cause tone loss, i have included a bright switch to help compensate for the loss in treble. It uses high quality miniature latching relays and precision discrete resistors to achieve a level of performance unattainable with conventional potentiometers or mechanical switchbased rotary stepped attenuators. A series attenuator the most common is the cheapest and has the fewest parts, it uses all resistors up to a given point as the voltage divider. The problem can be solved using an rca inline attenuator, but since a new one can be quite expens. Programmable attenuator data sheet is given in the quick reference guide. The easy solution is to use a rotary lpad controller. A stepped attenuator is geeky audio term for a complex multipole mechanical switch with a ton of resistors attached. An attenuator is effectively the opposite of an amplifier, though the two work by different methods.

So i purchase several grayhill rotary switch and off course several resistors to build it. My design uses a 100 watt lpad to attenuator the power of the amp. This particular lpad is rated at 100 watts rms, is designed to be used with 8 ohm loads, features a 1 shaft length, and comes with mounting hardware and faceplate. Mar 02, 2011 a series attenuator the most common is the cheapest and has the fewest parts, it uses all resistors up to a given point as the voltage divider. The keysight 117b attenuatorswitch driver provides remote or frontpanel drive control for 2 programmable attenuators and 2 spdt switches.

I have a l pad 16 ohm attenuator and looked into building one in 8ohm but found this sonorus 70w wall speaker attenuator instead. The wave driver i is an overdrive circuit with one folding stage and it has 2 configuration 3way switches 9 different configurations. Passive attenuator tutorial about passive attenuators. I had thought my choice was clear and was going to use the goldpoint 24 position elma switch as the attenuator with 0. If you are using attenuators and switches made by another company, check their switching characteristics against those specified in chapter 3, specifications. Also, i included a bypass switch for obvious reasons. Its rated for 70watts 8ohms and sold as a in wall speaker attenuator. Nov 10, 2019 diy stepped attenuator volume control 21 june 2012 in this diy attenuator project matt uses an inexpensive ladder type stepped attenuator to make a passive stereo volume control. Xr2206 signal generator module diy kit sinetrianglesquare wave 1hz. A program to analyse your own switchedattenuator circuit design of any topology. It consists only two resistors one in parallel with driver and one in series which. Amplifier stepped attenuators for sale in stock ebay.

The agilent 117a attenuator switch driver provides gpib or local front panel drive control for programmable attenuators and electromechanical switches. Designed with both benchtop and ate environments in mind, this flexible, standalone driver provides an intuitive user. The 117de attenuator switch drivers can be configured easily. The shure a15as switchable inline attenuator reduces the level of any balanced microphone or linelevel signal by 15, 20, or 25 db. Resistorswitch attenuator networks for audio volume control. Audio note has been using the noble ap25 pot and balance controls since the beginning, they were by far the best sounding at the price, the most reliable and solid mechanically, sadly noble decided to discontinue these excellent potentiometers in late 1997, at which time audio note bought. Ive added a switch to disconnect the speaker out, and a line out coming off pin 3 of the lpad using a series 5k resistor, a 5k pot, and a 1k resistor going to ground. As you can see below, it looks like rather large potentiometer. In cases where the ultimate driver speed is needed at. This elma a47 jumbo audio switch is a 1 pole 47 positions shunt type audio attenuator for large size leaded resistors. Speaker lpad attenuator 100w mono 1 shaft 8 ohm lpads adjust the relative volume of drivers connected to them by placing added resistance in series. The lpad is basically a resistive attenuator, so it doesnt have the musicianapproved mojo of a finelytuned real guitar amp attenuator. As for the main sustainer switch, theres more than one way it can be wired and in some cases you may need 3 or 4 pole switch. Silver contact 4 pole 23 way attenuator switch from uk company, blore edwards.

The expressodecaf switch is a bright switch which is useful because it adds a little crunch back in. My first was dact which using smd resistor and configured in series. The 117b attenuatorswitch driver is a gpibcompatible lxi optional instrument capable of driving up to two foursection programmable step attenuators and. Im still puttering on my amp and guitar projects, but heres the most recent progress. Im looking for some kind of instructions to build some passive line level attenuators for a live recording situation i often find myself in. Building an attenuatorloadbox with line out please check my. An attenuator is an electronics device that reduces the amplitude of a signal without appreciably distorting its waveform perfect for getting that cranked amp sound, at a lower, more manageable volume level. This section includes all available accessories for the aeroflex weinschel programmable attenuators such as our model 8210a attenuator switch controller, product specific driver boards, and our programmable attenuators with our builtin microprocessorbased drivers. Grayhill rotary switch as stepped attenuator jimmys junkyard. Hp agilent 117a attenuator switch driver laboratory sunrisesurplusinc. Diy stepped attenuator volume control 21 june 2012 in this diy attenuator project matt uses an inexpensive ladder type stepped attenuator to make a passive stereo volume control. Aug 10, 20 but once upon a time, i decided to stick with stepped attenuator. At the same time, a counterresistance is placed in parallel with the driver to maintain a constant impedance which allows the original crossover design to be used.

The 117b attenuator switch driver is a gpib compatible instrument that concurrently drives up to two foursection programmable step attenuators and two microwave coaxial switches, or up to 10 spdt switches2. This project arose from the fact that i had too much gain in my audio system, and i needed a practical solution without modifying the pcb circuit. While an amplifier provides gain, an attenuator provides loss, or gain less than 1. Simpler solution would be using only spdt switch for one attenuation step. Feb 16, 2012 call us at 8885058378 for all your refurbished test equipment needs, we offer warranties for up to 12 months and nist calibration on everything we sell. The completed unit contains single 1, 2, 3 and 5db sections. Hp agilent 117a attenuator switch driver laboratory youtube. Nice switches and resistors are available for instance at. An elma stepped attenuator populated with kiwame resistors. Rotary switches can also be utilised to create an attenuator, however, being a switch, the final volume control is not continuous but rather, moving in discrete. Call us at 8885058378 for all your refurbished test equipment needs, we offer warranties for up to 12 months and nist calibration on everything we sell. For those of you who are unfamiliar with the concept, an attenuator converts the output of your tube amp into heat, thus allowing you to crank your amp without the ear crushing volume. Rf attenuators fixed precision attenuators, highpower.

Ct2 uses a resistor network built on noninductive smd resistors. Lpads are to be placed in between the amplifier and driver sspeaker, or in between the crossover and driver sspeakers. Using a wallmounted speaker attenuator as a guitar amp power attenuator. The connection between the driver and switching devices is intuitive and direct. Jul 09, 2008 an attenuator is an electronics device that reduces the amplitude of a signal without appreciably distorting its waveform perfect for getting that cranked amp sound, at a lower, more manageable volume level. Single driver earheadphones usually just have a single mpedance peak in. The 117a is capable of driving up to ten switch or attenuator sections. Source selection is via the small switch by the volume control knob. This is the simplest implementation that kills the battery supply to preserve power and when engaged it wires bridge pickup to the amplifier. Danish audio connect manufactures a range of highend stepped audio attenuators for hifi, av and proaudio, used by diy audiophiles and audio equipment manufacturers throughout the world. Disconnect the sensor from the attenuator and insert the step attenuator, set step attenuator to 0 db, note the level on the power meter, now switch in the attenuator sections one by one, measure and note the level.

Each section consists of a dpdt slide switch and three 14w, 1%tolerance metalfilm resistors whose values are chosen to obtain the desired amount of attenuation. Installing the agilent technologies 117a attenuatorswitch driver. On the bench diy monitor controller audiotechnology. Lpads are to be placed in between the amplifier and driversspeaker, or in between the crossover and driversspeakers. But it sounds so good when its cranked all the way up, the family will be happier if i can turn it down sometimes. The keysight lxicompliant 117c attenuator switch driver provides remote or frontpanel drive control for 4 programmable attenuators and 4 spdt switches. Simply select the appropriate interface cable and you can make pointtopoint connection from the driver to the attenuator s andor switch es. Building an attenuatorloadbox with line out please check. The 117a attenuator switch driver is designed to drive the following agilent technologies attenuators and switches.

Keysight 117bc attenuatorswitch drivers operating and service manual 1 introduction key features of keysight 117bc attenuatorswitch drivers 12 compatible keysight attenuators and switches connecting accessories 117b front and rear panels at a glance 15 117c front and rear panels at a glance 18. Treble bypass cap is installed between lugs 1 and 2. Variable and switched attenuators are basically adjustable resistor networks that show a calibrated increase in attenuation for each switched step, for example. The vektrex intelligent rf switchattenuator controller visc provides a programmable interface to control rf switches and attenuators.

Xr2206 signal generator module diy kit sinetrianglesquare wave 1hz1mhz 912v. Remember, though, that any attenuator is going to sound better at lighttomoderate levels of attenuation, and sound less good when cutting down to bedroom levels. Agilent hp keysight 117a attenuatorswitch driver untested. This is a diy attenuator kit off of ebay for use with my 5 watt valco amp. There are also the dact attenuators that are very highly regarded. Virtually nothing is more simple than a passive device to adjust the volume of your music reproduction system.

It is special in using two decks of switches and two sets of resistors per channel. The number of resistors in the chain, as well as the number of switch steps, will depend on the attenuator resolution desired. The 117b attenuator switch driver is a gpibcompatible lxi optional instrument capable of driving up to two foursection programmable step attenuators and two microwave coaxial switches concurrently. Hp agilent precision step attenuator for hpagilent signal generator 8648.