Drake AC-4 Power Supply Rebuild

Excellent for use in tube radios, amps, hi-fi, etc, where a premium quality capacitor with high stability and reliability are required. Also ideal for telecommunications, industrial and general electronics equipment. Available in “hard to find” pre WWII sizes such as 0. Excellent for use in tube based radios, amps, televisions and test equipment such as Scopes where a premium quality capacitor with high stability and reliability are required. Extra long axial leads. Used in television, telecommunication, scientific and test equipment where extra high voltage, self healing property and long stable capacitor life are required. Rated Voltage Volts Orange epoxy coated for superior heat, solvent and moisture resistance.

A SHORT WAVE REGENERATIVE RECEIVER PROJECT

Another sign that might indicate a failing air conditioner compressor motor is an increase in the building’s electrical bills even though the air conditioning system “on” time has not changed. The compressor motor has burned out, is internally shorted or gounded. A service technician will use a VOM and typically will find low resistance low Ohms between one or more compressor terminals and ground.

A VOM connected to the compressor circuit indicates that no current is being drawn, but the condenser fan is running properly. An overheated motor may also leave the compressor motor “off” due to a tripped internal overload switch or a switch that has simply failed. If this is the problem, the motor should start normally once the unit has cooled down.

67 thoughts on “ TDAA Amplifier DIY Kit Schematic and soldering howto ” MA January 12, at What possesed you to hook a motor up to a audio circuit?!?! I am looking at this board to replace a blown up altec lansing vs, that just stopped working the.

Bridge mode doubles the output power and can be used to drive a sub-woofer loudspeaker. I cannot read Chinese and thus searched for an English manual but did not find any. I decided to reverse engineer the layout of the PCB to produce a schematic and better understand what I was building. They are all concentrated to where the power is supplied. This is needed because high power parts of the circuit could offset GND to a non 0 volt level and cause problems in the low power parts or other high power parts.

After carefully inspecting where all the traces go I came up with the following schematic. The schematic is mostly similar to the reference schematic in the TDA A datasheet. I used the one that can be found on www. The schematic is ordered in different blocks. Power and rectification, audio input and volume control, the left and right amplifier.

Capacitor Based 12V 300A Jump Starter

FM Transmitters Powerful microtransmitter that can cover 3km range. In our case the output power is about mW depending on the input power of 10mW and 9V battery power supply. The transistor Q1 must be mounted with a heatsink, the heatsink must have small dimensions cylindrical in order not to increase the parasitic capacitance.

Drake AC-4 Power Supply Rebuild. The Drake AC-4 power supply was used to power a number of transmitters and transceivers in the drake “4” line.

April 30, at There are at least three micro-switches actuated by the door mechanism. Normally one of these switches activates the circuit for powering the magnetron when the door is shut; however, that switch can fail, so to ensure that the magnetron never comes on when the door is open, another switch in that same door switch assembly will short the power to the magnetron and blow the fuse if power is ever supplied to the magnetron while it thinks the door is open.

These switches, and the plastic assembly that holds them in place takes a lot of abuse, and many many cycles. It will fail given enough time or enough kitchen grease. This is one of the most common problems I have found with discarded microwaves. The switches can fail shorted failure to open when it is supposed to , and the switches can fail open failure to close when it is supposed to. Additionally the failure can be intermittent, and can even be due to the mechanical alignment of the switches to the actuator assembly on the door.

Most of the switches are single throw, infrequently I see double throw switches. The function of the switch connector is usually molded into the plastic of the switch normally means when the actuator is not depressed C:

Capacitor Based 12V 300A Jump Starter

I had not seen any pictures of the AC-4 I obtained prior to purchasing it. I figured, it is just a power supply, how much can go wrong. When I received the AC-4, and went over it, I did find a number of questionable things. This page describes my experiences rebuilding the AC-4 to be placed into service. It is worth noting, I used replacement capacitors from the Hayseed Hamfest Company as I was looking for a more original rebuild.

67 thoughts on “ TDAA Amplifier DIY Kit Schematic and soldering howto ” MA January 12, at What possesed you to hook a motor up to a audio circuit?!?! I am looking at this board to replace a blown up altec lansing vs, that just stopped working the.

How this came into being, what it is for. What they are, where to get one, what to do with them. How to wind a new primary. What you need to know about these solid state switches. Parts list, how to put it all together and what you can change to make it work for you. Includes pictures and videos of the flyback outputting arcs at maximum power and running an ion engine and a cascade.

Also includes a short chapter on troubleshooting. This is not a toy, and shouldn’t be treated as such. Experiments and devices that can be derived from this. This is by far the best project for someone who is already familiar with High Voltage, but wants to take their experiments to the next level: It requires very little previous experience and skills with soldering and identifying components, and there are virtually no adjustments to be made.

The danger is minimal, as fly back transformers are intrinsically low power devices, not capable of outputting lethal currents due to the hair-thin secondary windings , and yet it will give a careless experimenter a nasty RF burn if he accidentally touches the HV wire nothing beats learning from your mistakes.

Circuit Analysis of the 1.8kW Induction Hotplate

Telephone For those states or countries that require a ‘lights on’ driving situation, don’t touch the actual glass of the bulb. One side of the condensor should be unsoldered. I would recommend the side opposite the HT turret on the slip ring. Primary low tension resistance as measured from the amrature core to the wires that you just unsoldered shuld be approximately 0. Secondary high tension resistance measured from armature core to slip ring brass should be – Ohms.

Distributor of electronics, electronic components, electronic parts, electronic kits, hobby electronics, surplus electronics, DIY electronics, discount electronics.

Permission is hereby granted to quote our text so long as proper credit is given. Jim and Bob’s DIY Mods For those interested in modifying tuner audio sections, this page offers a few general suggestions, followed by specific information relating to many Kenwoods and several other vintage tuners. Return ground path – On the Kenwood KT , there is a way to help ensure the integrity of the return ground path. There are four screws that clamp the circuit board to the steel frame, which holds the power transformer and more.

Loose screws can cause electrical problems in the KT and other tuners. First, remove the screws and inspect the board and frame for corrosion or dirt.

One more step

FM Transmitters This simple mW transmitter broadcasts audio on With good dipole antenna transmission range up to 4km is possible. Frequency is selected by adjusting R1 potentiometer. Transmitter should be powered by regulated V power supply with at least mA current rating.

3E Technology, Inc. Part Number & Description List: (Partial List, More than kb) Please note that some of the lists are quite long! Please select company by clicking on one of the characters.

That did not explain the source of the ground loop though, it merely eliminate the additional path to signal ground. I had no supply ground wires connected to chassis and the only ground connection to chassis was the safety EARTH ground, so where did the ground loop come from? After some poking with a voltmeter, I figured the real source of the ground loop. The mounting holes of the DAC board are encircled with ground pads. These short to the mounting posts and the mounting posts short to the chassis.

Having signal ground connected to the chassis is probably a safety feature but for audio, it is best to avoid it. I have built all my electronics with the signal ground the supply ground isolated from the chassis and to ensure safety I use a 3-wire power cord with the EARTH ground wire the green wire connected to the chassis.

Utility Tools & Supplies

See the FAQ for more information on this very cool feature! You should see your gravatar displayed in all it’s glory over in the sidebar. Don’t have a gravatar? It’s free and once you do, your new gravatar will appear in the sidebar and in the comments you make on any mod. See the FAQ for more information. Tired of lugging an extra propane tank around just for your BBQ?

TMC Cd, Cd60, Capacitor uf v 50/60hz, mfd VAC.

Servicing Fender Amplifiers This is my Fender amp servicing guide. I developed this service guide after many years of servicing Fender Vintage amplifiers. Many Fenders used the same circuit inside with just a few different parts in the same spot on the board. You don’t need a special service guide for each amp to be able to service a Deluxe Reverb, Super Reverb, Pro reverb or any of the vintage fender amps. Before doing any service work on an amplifier, you must make sure the amplifier is unplugged from the wall and the filter caps are drained.

Filter caps can hold a charge that can give you a severe shock. The easiest way to drain your filter caps is to warm up the amp and then play the amp. Do not shut the amp off with the power switch or the standby switch. Just unplug the amp from the wall and keep strumming your guitar until the sound dies away. Once the sound dies down, the voltage in the filter caps will be below a level that can hurt you.

Homepage Specials!

FM Transmitters This simple mW transmitter broadcasts audio on With good dipole antenna transmission range up to 4km is possible. Frequency is selected by adjusting R1 potentiometer. Transmitter should be powered by regulated V power supply with at least mA current rating.

The above FM transmitter design is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA transmitter designs, compare their performance, identify weaknesses and come up with a new BA transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter’s range, and is fairly simple for everyone to build.

It is an extremely simple configuration: I suspect sound quality is overwhelmingly determined by the chip and not so much by implementation. Of course some minimum level of quality is required for all the components. The kit is also suitable for beginners because all the components are through-hole and there is ample space. There is a discussion on these Ti TPA31xx amps over at diyaudio [ link ].

The reports are good. Here are some photos: Very nice quality board. Nowadays almost any PCB from China is top-notch in quality.

3 terminals capacitor Air conditioner wiring diagram – Hindi