A number of visitors to this site have asked about power supplies for operating battery valve radios from the mains. Many later radios use four 7-pin valves and require a 90V HT supply at typically 12mA and a 1.5V LT supply at 125mA or 250mA depending on the valves used. The original batteries are sadly no longer made.
Some radios require 45 or 22.5 volts of B+ current. To lower the power supply voltage to the desired value, you'll need to make a voltage divider. Adding a pair of 5-watt wirewound or carbon resistors in series across the output from B+ to B- easily does this. You'll need to use a multimeter to determine the correct values for these resistors.
Our radio is in need of two power supplies: a high tension 'B' supply for the circuitry and a low tension 'A' supply for the tube filaments ('valve heaters' in Brit.English). The 'A' battery is easy: simply combine modern 'D' or 'C' size alkaline cells in series for the required voltage.
The B+ for this radio is 135V. Most battery-powered radios need a B+ supply of 90-135V DC at up to about 12mA (<1.7W). So I chose a 5W PCBmounting mains transformer which I used backwards, with the 230V primary used as the secondary output winding.
Although simple to construct, this battery supply will not last long and you will still have the problem of disposal. For about $10, you can build a simple circuit that converts 120-volt AC household current into the DC current needed for a battery radio's B supply.
These antique radios required two different batteries for operation, an "A" and a "B" battery. Some models even required a third "C" battery supply. The "A" battery provided power to the tube filaments (typically 1.5 to 6 volts) and the "B" battery provided the plate voltage to the tubes.
Power Supply for Battery-Powered Vintage Radios
Try this compact and easy-to-build module: using Li-ion or LiPo cells, it can generate both the A and B supplies for most battery valve sets and suits sets with a wide range of HT voltages. It …
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Providing Power To Your Battery Tube Portable Radio
Our radio is in need of two power supplies: a high tension ''B'' supply for the circuitry and a low tension ''A'' supply for the tube filaments (''valve heaters'' in Brit.English). The ''A'' battery is easy: simply combine modern ''D'' or ''C'' size …
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Antique Battery Radio Power Supply
To properly test and operate my antique battery radios, I designed and built a multi-voltage power supply. Most of the old battery radios require several defferent voltages that were originally supplied by using several batteries, some of which had taps for more than one voltage.
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Power Supply for Battery Valve Radios
A number of visitors to this site have asked about power supplies for operating battery valve radios from the mains. Many later radios use four 7-pin valves and require a 90V HT supply at typically 12mA and a 1.5V LT supply at 125mA or …
Learn More
Power Supply for Battery-Powered Vintage Radios
For most vintage radios, A & B batteries are extremely difficult to obtain. This power supply lets you use common Li-ion or LiPo cells to provide the A & B supplies for battery valve sets with HT in the range of 24-135V and LT of 1.2-2.5V. by Ken Kranz & Nicholas Vinen
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Powering Your Antique Battery Radio
To properly test and operate my antique battery radios, I designed and built a multi-voltage power supply. Most of the old battery radios require several defferent voltages that were originally supplied by using several batteries, …
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How to Convert Battery Operated Devices to AC
This is especially useful for devices that require a lot of power, such as RVs or portable radios. By connecting the device to a power grid, you can ensure that it is receiving a steady supply of power, which can help to extend the life of the device. Long-Term Maintenance. Long-term maintenance is also important when converting a battery-operated device to AC …
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Antique Radio B-Battery Power Supply
Antique Radio B-Battery Power Supply: Early vacuum tube (valve) radios ran off of batteries instead of house current. These antique radios required two different batteries for operation, an "A" and a "B" battery. Some models even required a third "C" battery supply. The "A" battery …
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How to Wire a Car Stereo Directly to the Battery
It provides power to the stereo''s memory and clock, allowing them to retain their settings even when the car is turned off. How do I turn on a car radio at home? To turn on a car radio at home, you will need to connect it to a 12V power supply. You can use a power supply unit or a car battery to power the radio. Refer to the search results ...
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Battery Eliminator
A simple, but effective DC power supply for those Type A supplies at 1.5VDC and Type B supplies between 67.5 and 90.0VDC. Keep in mind, the power transformer limits the output current to...
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How to manage power settings on Windows 11
To change the power action when closing the laptop lid on Windows 11, use these steps: ... Click the Power & battery (or Power) page on the right side. (Image credit: Mauro Huculak) Click the ...
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Powering Your Antique Battery Radio
This article gives you some history on battery use in old radios and advice on how to power them with modern batteries. It also gives plans for two inexpensive battery eliminators that you can build, with additional suggestions and technical data.
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Providing Power To Your Battery Tube Portable Radio
Our radio is in need of two power supplies: a high tension ''B'' supply for the circuitry and a low tension ''A'' supply for the tube filaments (''valve heaters'' in Brit.English). The ''A'' battery is easy: simply combine modern ''D'' or ''C'' size alkaline cells in series for the required voltage.
Learn More
Transistor Radio Power Supply Arrangements
The switching between mains and battery is normally done on the low voltage side. If the mains lead is detachable, the switch is normally part of the socket and is actuated by inserting the …
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Power Supply for Battery Valve Radios
A number of visitors to this site have asked about power supplies for operating battery valve radios from the mains. Many later radios use four 7-pin valves and require a 90V HT supply at typically 12mA and a 1.5V LT supply at 125mA or 250mA depending on the valves used. The original batteries are sadly no longer made.
Learn More
How to Change a Car Battery Without Losing Settings
How do you change a battery without losing the memory? To change a battery without losing the memory, follow these steps: Turn off your car''s engine and remove the key from the ignition. Locate the battery and disconnect the negative cable first and then the positive cable. Be sure to keep the cables away from each other and the car''s metal ...
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Repowering a Old Radio Circuit (Powered by Batteries)
Ever have an old radio that powers only in AC and doesn''t have a battery inside? Today, I will show you how to power your old radio with a battery and useful if there''s a Power outage, and your radio''s power depended on the battery without connecting the AC to your radio.
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How to Change a Car Battery Without Losing Adaptive Memory
4) Remove the negative cable from the car battery and set it aside. 5) Remove the positive battery cable from the battery and immediately wrap it in the electrician''s tape. This is important because the positive cable has power from the jumper pack. If it touches any metal component, it will blow the fuse, powering the OBDII port. 6) Change ...
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Repowering a Old Radio Circuit (Powered by Batteries)
Ever have an old radio that powers only in AC and doesn''t have a battery inside? Today, I will show you how to power your old radio with a battery and useful if there''s a Power outage, and your radio''s power depended on the battery …
Learn More
Transistor Radio Power Supply Arrangements
The switching between mains and battery is normally done on the low voltage side. If the mains lead is detachable, the switch is normally part of the socket and is actuated by inserting the mains lead connector.
Learn More
Power Supply for Battery-Powered Vintage Radios
Try this compact and easy-to-build module: using Li-ion or LiPo cells, it can generate both the A and B supplies for most battery valve sets and suits sets with a wide range of HT voltages. It generates virtually no EMI (which could interfere with radio reception).
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How to Change a Car Battery without Losing Radio Code
This tutorial will teach you how to change your battery without the power being cut to your vehicle. Tools you''ll require: Small socket set - usually 8, 10, 12 and 13mm will be enough ; A booster/jump pack OR a set of jump leads and any 12 Volt battery; Step 1 - Find your battery. Open your bonnet and locate the battery. In many cases the battery may be in a plastic box or …
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How to Change Car Battery Without Losing Settings: …
To guarantee uninterrupted power supply while replacing the battery, understanding different power sources is key. These sources provide stable electricity to keep settings intact during the process. If a direct connection isn''t …
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Building a simple solid state Battery Radio Power Supply Part 1.
In my never ending quest for a fully working battery radio PSU, I found another schematic; this time a solid state battery radio power supply which looks promising on paper. I gutted the...
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Antique Radio B-Battery Power Supply
Antique Radio B-Battery Power Supply: Early vacuum tube (valve) radios ran off of batteries instead of house current. These antique radios required two different batteries for operation, an "A" and a "B" battery. Some models even required a …
Learn More
How to Change a Car Battery Without Losing Settings
This maintains power to the vehicle''s electrical system while the battery is being replaced. Quick Battery Swap: If you have a spare battery or access to a backup power source, you can perform a quick battery swap by connecting the backup battery to the vehicle''s electrical system before disconnecting the old battery. 7. Double-Check ...
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How to change power modes for performance or battery on …
You can change the power mode for performance or battery, and in this guide, I''ll show you three different ways. When you purchase through links on our site, we may earn an affiliate commission ...
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